Crest Audio Stereo Amplifier CPX 3800 User Manual

CPX  
®
TM  
CPX 3800  
Power Amplifier Owner’s  
Manual  
 
IMPORTANT SAFETY INSTRUCTIONS  
WARNING: When using electrical products, basic cautions should always be followed, including the following:  
1.  
Read these instructions.  
2.  
3.  
4.  
5.  
6.  
7.  
8.  
Keep these instructions.  
Heed all warnings.  
Follow all instructions.  
Do not use this apparatus near water.  
Clean only with a dry cloth.  
Do not block any of the ventilation openings. Install in accordance with manufacturer’s instructions.  
Do not install near any heat sources such as radiators, heat registers, stoves or other apparatus (including amplifiers) that  
produce heat.  
9.  
Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than  
the other. A grounding type plug has two blades and a third grounding plug. The wide blade or third prong is provided for your  
safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.  
10.  
Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point they exit  
from the apparatus.  
11.  
Only use attachments/accessories provided by the manufacturer.  
12.  
Use only with a cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is  
used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.  
14.  
Unplug this apparatus during lightning storms or when unused for long periods of time.  
Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such  
as when power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus  
has been exposed to rain or moisture, does not operate normally, or has been dropped.  
15.  
Never break off the ground pin. Write for our free booklet “Shock Hazard and Grounding.” Connect only to a power supply of  
the type marked on the unit adjacent to the power supply cord.  
16.  
17.  
If this product is to be mounted in an equipment rack, rear support should be provided.  
Note for UK only: If the colors of the wires in the mains lead of this unit do not correspond with the terminals in your plug‚  
proceed as follows:  
a) The wire that is colored green and yellow must be connected to the terminal that is marked by the letter E‚ the earth symbol‚  
colored green or colored green and yellow.  
b) The wire that is colored blue must be connected to the terminal that is marked with the letter N or the color black.  
c) The wire that is colored brown must be connected to the terminal that is marked with the letter L or the color red.  
18.  
19.  
This electrical apparatus should not be exposed to dripping or splashing and care should be taken not to place objects  
containing liquids, such as vases, upon the apparatus.  
The on/off switch in this unit does not break both sides of the primary mains. Hazardous energy can be present inside the  
chassis when the on/off switch is in the off position. The mains plug or appliance coupler is used as the disconnect device, the  
disconnect device shall remain readily operable.  
20.  
Exposure to extremely high noise levels may cause a permanent hearing loss. Individuals vary considerably in susceptibility to  
noise-induced hearing loss, but nearly everyone will lose some hearing if exposed to sufficiently intense noise for a sufficient  
time. The U.S. Government’s Occupational Safety and Health Administration (OSHA) has specified the following permissible  
noise level exposures:  
Duration Per Day In Hours  
Sound Level dBA, Slow Response  
8
6
90  
92  
4
3
95  
97  
2
1.5  
1
.5  
100  
102  
105  
110  
115  
.25 or less  
According to OSHA, any exposure in excess of the above permissible limits could result in some hearing loss. Earplugs or protectors to  
the ear canals or over the ears must be worn when operating this amplification system in order to prevent a permanent hearing loss, if  
exposure is in excess of the limits as set forth above. To ensureagainst potentially dangerous exposure to high sound pressure levels, it is  
recommended that all persons exposed to equipment capable of producing high sound pressure levels such as this amplification system be  
protected by hearing protectors while this unit is in operation.  
SAVE THESE INSTRUCTIONS!  
 
WICHTIGE SICHERHEITSHINWEISE  
ACHTUNG: Beim Einsatz von Elektrogeräten müssen u.a. grundlegende Vorsichtsmaßnahmen befolgt werden:  
1.  
Lesen Sie sich diese Anweisungen durch.  
2.  
3.  
4.  
5.  
6.  
7.  
8.  
Bewahren Sie diese Anweisungen auf.  
Beachten Sie alle Warnungen.  
Befolgen Sie alle Anweisungen.  
Setzen Sie dieses Gerät nicht in der Nähe von Wasser ein.  
Reinigen Sie es nur mit einem trockenen Tuch.  
Blockieren Sie keine der Lüftungsöffnungen. Führen Sie die Installation gemäß den Anweisungen des Herstellers durch.  
Installieren Sie das Gerät nicht neben Wärmequellen wie Heizungen, Heizgeräten, Öfen oder anderen Geräten (auch Verstärkern), die  
Wärme erzeugen.  
9.  
Beeinträchtigen Sie nicht die Sicherheitswirkung des gepolten Steckers bzw. des Erdungssteckers. Ein gepolter Stecker weist zwei  
Stifte auf, von denen einer breiter ist als der andere. Ein Erdungsstecker weist zwei Stifte und einen dritten Erdungsstift auf. Der breite  
Stift bzw. der dritte Stift dient Ihrer Sicherheit. Sollte der beiliegende Stecker nicht in Ihre Steckdose passen, wenden Sie sich bitte an  
einen Elektriker, um die ungeeignete Steckdose austauschen zu lassen.  
10.  
Schützen Sie das Netzkabel, sodass niemand darauf tritt oder es geknickt wird, insbesondere an Steckern oder Buchsen und ihren  
Austrittsstellen aus dem Gerät.  
11.  
Verwenden Sie nur die vom Hersteller erhältlichen Zubehörgeräte oder Zubehörteile.  
12.  
Verwenden Sie nur einen Wagen, Stativ, Dreifuß, Träger oder Tisch, der den Angaben des Herstellers entspricht oder zusammen  
mit dem Gerät verkauft wurde. Wird ein Wagen verwendet, bewegen Sie den Wagen mit dem darauf befindlichen Gerät besonders  
vorsichtig, damit er nicht umkippt und möglicherweise jemand verletzt wird.  
13.  
14.  
Trennen Sie das Gerät während eines Gewitters oder während längerer Zeiträume, in denen es nicht benutzt wird, von der  
Stromversorgung.  
Lassen Sie sämtliche Wartungsarbeiten von qualifizierten Kundendiensttechnikern durchführen. Eine Wartung ist erforderlich, wenn  
das Gerät in irgendeiner Art beschädigt wurde, etwa wenn das Netzkabel oder der Netzstecker beschädigt wurden, Flüssigkeit  
oder Gegenstände in das Gerät gelangt sind, das Gerät Regen oder Feuchtigkeit ausgesetzt wurde, nicht normal arbeitet oder  
heruntergefallen ist.  
15.  
Der Erdungsstift darf nie entfernt werden. Auf Wunsch senden wir Ihnen gerne unsere kostenlose Broschüre „Shock Hazard and  
Grounding“ (Gefahr durch elektrischen Schlag und Erdung) zu. Schließen Sie nur an die Stromversorgung der Art an, die am Gerät  
neben dem Netzkabel angegeben ist.  
16.  
17.  
Wenn dieses Produkt in ein Geräte-Rack eingebaut werden soll, muss eine Versorgung über die Rückseite eingerichtet werden.  
Hinweis – Nur für Großbritannien: Sollte die Farbe der Drähte in der Netzleitung dieses Geräts nicht mit den Klemmen in Ihrem Stecker  
übereinstimmen, gehen Sie folgendermaßen vor:  
a) Der grün-gelbe Draht muss an die mit E (Symbol für Erde) markierte bzw. grüne oder grün-gelbe Klemme angeschlossen werden.  
b) Der blaue Draht muss an die mit N markierte bzw. schwarze Klemme angeschlossen werden.  
c) Der braune Draht muss an die mit L markierte bzw. rote Klemme angeschlossen werden.  
18.  
19.  
Dieses Gerät darf nicht ungeschützt Wassertropfen und Wasserspritzern ausgesetzt werden und es muss darauf geachtet werden, dass  
keine mit Flüssigkeiten gefüllte Gegenstände, wie z. B. Blumenvasen, auf dem Gerät abgestellt werden.  
Der Netzschalter in dieser Einheit bricht beide Seiten von den primären Haupleitungen nicht. Gerfährliche Energie kann anwesend  
innerhalb des Chassis sein, wenn her Netzschalter im ab Position ist. Die Hauptleitungen stöpseln zu oder Gerätkupplung ist benutzt,  
während das Vorrichtung abschaltet, das schaltet Vorrichtung wird bleiben sogleich hantierbar ab.  
20. Belastung durch extrem hohe Lärmpegel kann zu dauerhaftem Gehörverlust führen. Die Anfälligkeit für durch Lärm bedingten Gehörverlust  
ist von Mensch zu Mensch verschieden, das Gehör wird jedoch bei jedem in gewissem Maße geschädigt, der über einen bestimmten Zeitraum  
ausreichend starkem Lärm ausgesetzt ist. Die US-Arbeitsschutzbehörde (Occupational and Health Administration, OSHA) hat die folgenden  
zulässigen Pegel für Lärmbelastung festgelegt:  
Dauer pro Tag in Stunden  
Geräuschpegel dBA, langsame Reaktion  
8
6
90  
92  
4
95  
3
97  
2
1.5  
1
.5  
100  
102  
105  
110  
115  
.25 oder weniger  
Laut OSHA kann jede Belastung über den obenstehenden zulässigen Grenzwerten zu einem gewissen Gehörverlust führen. Sollte  
die Belastung die obenstehenden Grenzwerte übersteigen, müssen beim Betrieb dieses Verstärkungssystems Ohrenstopfen oder  
Schutzvorrichtungen im Gehörgang oder über den Ohren getragen werden, um einen dauerhaften Gehörverlust zu verhindern. Um sich vor  
einer möglicherweise gefährlichen Belastung durch hohe Schalldruckpegel zu schützen, wird allen Personen empfohlen, die mit Geräten  
arbeiten, die wie dieses Verstärkungssystem hohe Schalldruckpegel erzeugen können, beim Betrieb dieses Geräts einen Gehörschutz zu tra-  
gen.  
BEWAHREN SIE DIESE SICHERHEITSHINWEISE AUF!  
 
INSTRUCTIONS IMPORTANTES DE SECURITE  
ATTENTION: L’utilisation de tout appareil électrique doit être soumise aux precautions d’usage incluant:  
1.  
Lire ces instructions.  
2.  
3.  
4.  
5.  
6.  
7.  
Gardez ce manuel pour de futures références.  
Prétez attention aux messages de précautions de ce manuel.  
Suivez ces instructions.  
N’utilisez pas cette unité proche de plans d’eau.  
N’utilisez qu’un tissu sec pour le nettoyage de votre unité.  
N’obstruez pas les systèmes de refroidissement de votre unité et installez votre unité en fonction des instructions de ce  
manuel.  
8.  
Ne positionnez pas votre unité à proximité de toute source de chaleur.  
9.  
Connectez toujours votre unité sur une alimentation munie de prise de terre utilisant le cordon d’alimentation fourni.  
Protégez les connecteurs de votre unité et positionnez les cablages pour éviter toutes déconnexions accidentelles.  
N’utilisez que des fixations approuvées par le fabriquant.  
10.  
11.  
12.  
Lors de l’utilsation sur pied ou pole de support, assurez dans le cas de déplacement de l’ensemble enceinte/support de  
prévenir tout basculement intempestif de celui-ci.  
13.  
14.  
Il est conseillé de déconnecter du secteur votre unité en cas d’orage ou de durée prolongée sans utilisation.  
Seul un technicien agréé par le fabriquant est à même de réparer/contrôler votre unité. Celle-ci doit être contrôlée si elle  
a subit des dommages de manipulation, d’utilisation ou de stockage (humidité,…).  
15.  
16.  
17.  
Ne déconnectez jamais la prise de terre de votre unité.  
Si votre unité est destinée a etre montée en rack, des supports arriere doivent etre utilises.  
Note pour les Royaumes-Unis: Si les couleurs de connecteurs du cable d’alimentation ne correspond pas au guide de la  
prise secteur, procédez comme suit:  
a) Le connecteur vert et jaune doit être connectrer au terminal noté E, indiquant la prise de terre ou correspondant aux  
couleurs verte ou verte et jaune du guide.  
b) Le connecteur Bleu doit être connectrer au terminal noté N, correspondnat à la couleur noire du guide.  
c) Le connecteur marron doit être connectrer au terminal noté L, correspondant à la couleur rouge du guide.  
18.  
19.  
Cet équipement électrique ne doit en aucun cas être en contact avec un quelconque liquide et aucun objet contenant un  
liquide, vase ou autre ne devrait être posé sur celui-ci.  
L'interrupter (on-off) dans cette unitè ne casse pas les deux côtès du primaire principal. L'énergie hasardeuse peut  
être preésente dans le châssis quand l'interrupter (on-off) est dans le de la position. Le bouchon principal ou atelage  
d'appareil est utilisé comme le débrancher l'appareil restera facilement opérable.  
20.  
Une exposition à de hauts niveaux sonores peut conduire à des dommages de l’écoute irréversibles. La susceptibilité  
au bruit varie considérablement d’un individu à l’autre, mais une large majorité de la population expériencera une  
perte de l’écoute après une exposition à une forte puissance sonore pour une durée prolongée. L’organisme de la santé  
américaine (OSHA) a produit le guide ci-dessous en rapport à la perte occasionnée:  
Durée par Jour (heures)  
Niveau sonore moyen (dBA)  
8
6
90  
92  
4
95  
3
97  
2
1.5  
1
.5  
100  
102  
105  
110  
115  
.25 ou inférieur  
D’après les études menées par le OSHA, toute exposition au delà des limites décrites ce-dessus entrainera des pertes de l’écoute chez la  
plupart des sujets. Le port de système de protection (casque, oreilette de filtrage,…) doit être observé lors de l’opération cette unité ou des  
dommages irréversibles peuvent être occasionnés. Le port de ces systèmes doit être observé par toutes personnes susceptibles d’être expo-  
sées à des conditions au delà des limites décrites ci-dessus.  
GARDEZ CES INSTRUCTIONS!  
 
INSTRUCCIONES IMPORTANTES PARA SU SEGURIDAD  
CUIDADO: Cuando use productos electrónicos, debe tomar precauciones básicas, incluyendo las siguientes:  
1.  
Lea estas instrucciones.  
2.  
3.  
4.  
5.  
6.  
7.  
8.  
Guarde estas instrucciones.  
Haga caso de todos los consejos.  
Siga todas las instrucciones.  
No usar este aparato cerca del agua.  
Limpiar solamente con una tela seca.  
No bloquear ninguna de las salidas de ventilación. Instalar de acuerdo a las instrucciones del fabricante.  
No instalar cerca de ninguna fuente de calor como radiadores, estufas, hornos u otros aparatos (incluyendo amplificadores) que  
produzcan calor.  
9.  
No retire la patilla protectora del enchufe polarizado o de tipo “a Tierra”. Un enchufe polarizado tiene dos puntas, una de ellas más  
ancha que la otra. Un enchufe de tipo “a Tierra” tiene dos puntas y una tercera “a Tierra”. La punta ancha (la tercera ) se proporciona  
para su seguridad. Si el enchufe proporcionado no encaja en su enchufe de red, consulte a un electricista para que reemplaze su  
enchufe obsoleto.  
10.  
Proteja el cable de alimentación para que no sea pisado o pinchado, particularmente en los enchufes, huecos, y los puntos que salen  
del aparato.  
11.  
Usar solamente añadidos/accesorios proporcionados por el fabricante.  
12.  
Usar solamente un carro, pie, trípode, o soporte especificado por el fabricante, o vendido junto al aparato. Cuando se use un carro,  
tenga cuidado al mover el conjunto carro/aparato para evitar que se dañe en un vuelco. No suspenda esta caja de ninguna manera.  
13.  
1
Desenchufe este aparato durante tormentas o cuando no sea usado durante largos periodos de tiempo.  
Para cualquier reparación, acuda a personal de servicio cualificado. Se requieren reparaciones cuando el aparato ha sido dañado de  
alguna manera, como cuando el cable de alimentación o el enchufe se han dañado, algún líquido ha sido derramado o algún objeto ha  
caído dentro del aparato, el aparato ha sido expuesto a la lluvia o la humedad, no funciona de manera normal, o ha sufrido una caída.  
15.  
Nunca retire la patilla de Tierra.Escríbanos para obtener nuestro folleto gratuito “Shock Hazard and Grounding” (“Peligro de  
Electrocución y Toma a Tierra”). Conecte el aparato sólo a una fuente de alimentación del tipo marcado al lado del cable de  
alimentación.  
16.  
17.  
Si este producto va a ser enracado con más equipo, use algún tipo de apoyo trasero.  
Nota para el Reino Unido solamente: Si los colores de los cables en el enchufe principal de esta unidad no corresponden con los  
terminales en su enchufe‚ proceda de la siguiente manera:  
a) El cable de color verde y azul debe ser conectado al terminal que está marcado con la letra E‚ el símbolo de Tierra (earth)‚ coloreado  
en verde o en verde y amarillo.  
b) El cable coloreado en azul debe ser conectado al terminal que está marcado con la letra N o el color negro.  
c) El cable coloreado en marrón debe ser conectado al terminal que está marcado con la letra L o el color rojo.  
18.  
19.  
Este aparato eléctrico no debe ser sometido a ningún tipo de goteo o salpicadura y se debe tener cuidado para no poner objetos que  
contengan líquidos, como vasos, sobre el aparato.  
El interruptor de en/lejos en esta unidad no rompe ambos lados de la red primaria. La energía peligrosa puede ser presente dentro del  
chasis cuando el interruptor de en/lejos está en el de la posición. El tapón de la red o el acoplador del aparato son utilizados como el  
desconecta dispositivo, el desconecta dispositivo se quedará fácilmente operable.  
20.  
La exposición a altos niveles de ruido puede causar una pérdida permanente en la audición. La susceptibilidad a la pérdida de  
audición provocada por el ruido varía según la persona, pero casi todo el mundo perderá algo de audición si se expone a un nivel de  
ruido suficientemante intenso durante un tiempo determinado. El Departamento para la Salud y para la Seguridad del Gobierno de los  
Estados Unidos (OSHA) ha especificado las siguientes exposiciones al ruido permisibles:  
Duración por Día en Horas Nivel de Sonido dBA, Respuesta Lenta  
8
6
90  
92  
4
95  
3
97  
2
1.5  
100  
102  
105  
110  
115  
1
.5  
.25 o menos  
De acuerdo al OSHA, cualquier exposición que exceda los límites arriba indicados puede producir algún tipo de pérdida en la audición.  
Protectores para los canales auditivos o tapones para los oídos deben ser usados cuando se opere con este sistema de sonido para preve-  
nir una pérdida permanente en la audición, si la exposición excede los límites indicados más arriba. Para protegerse de una exposición a  
altos niveles de sonido potencialmente peligrosa, se recomienda que todas las personas expuestas a equipamiento capaz de producir altos  
niveles de presión sonora, tales como este sistema de amplificación, se encuentren protegidas por protectores auditivos mientras esta uni-  
dad esté operando.  
GUARDE ESTAS INSTRUCCIONES!  
 
important precautions  
Service Information  
Save the carton and packing materi-  
als! Should you ever need to ship the  
unit, use only the original factory pack-  
ing.  
Do not run the output of any ampli-  
fier channel back into another  
channel’s input.  
1
¡
Do not remove the cover!  
Removing the cover will expose you to  
potentially dangerous voltages.There are  
no user-serviceable parts inside.  
Do not parallel- or series-con-  
nect an amplifier output with any  
other amplifier output.  
For replacement packaging, call Crest  
Performance’s  
Customer  
Service  
Equipment should be serviced by  
qualified service personnel when:  
Department directly.  
Crest Performance is not responsible for  
damage to loudspeakers for any reason.  
A. The power supply cord or the plug has  
Read all documentation before  
operating your equipment. Retain all  
documentation for future reference.  
2
3
been damaged.  
Do not connect the inputs or  
outputs of amplifiers to any  
other voltage source, such as a  
battery, mains source or power supply,  
regardless of whether the amplifier is  
turned on or off.  
Ô
£
B. The equipment has been exposed to rain.  
C. The equipment does not appear to oper-  
ate normally or exhibits a marked change  
in performance.  
Follow all instructions printed on  
unit chassis for proper operation.  
D. The equipment has been dropped or the  
enclosure damaged.  
Connecting amplifier outputs to  
oscilloscopes or other test equip-  
mentwhiletheamplifierisinbridged  
mono mode may damage both the  
amplifier and test equipment!  
Never hold a power switch or cir-  
cuit breaker in the "ON" position  
if it won’t stay there by itself!  
4
5
To obtain service:  
contact your nearest Crest  
Performance Service Center,  
Distributor, Dealer or Crest  
Performance at 601.486.2000 USA  
for additional information, email  
techserve@crestaudio.com  
Do not use the unit if the electrical  
power cord is frayed or broken.  
The power supply cords should be  
routed so that they are not likely to be  
walked on or pinched by items placed  
upon or against them.  
Do not spill water or other liquids  
into or on the unit, or operate the  
unit while standing in liquid.  
¢
ˆ
Always operate the unit with the  
AC ground wire connected to the  
electrical system ground. Precautions  
should be taken so that the means of  
grounding of a piece of equipment is not  
defeated.  
6
Do not block fan intake or exhaust  
ports.  
Do not operate equipment on  
a surface or in an environment  
which may impede the nor-  
mal flow of air around the unit,  
such as a bed, rug, weathersheet, carpet  
or completely enclosed rack.  
This symbol is used to alert  
the operator to follow important  
procedures and precautions  
detailed in documentation.  
Damage caused by connection to  
improper AC voltage is not cov-  
ered by any warranty. Mains voltage  
must be correct and the same as that  
printed on the rear of the unit.  
7
8
This symbol is used to warn opera-  
tors that uninsulated “dangerous  
voltages” are present within the  
equipment enclosure that may  
pose a risk of electric shock.  
If the unit is used in an extremely  
dusty or smoky environment the  
unit should be periodically blown free  
of foreign matter.  
§
Do not ground any hot (red) terminal.  
Never connect a hot (red) output to  
ground or to another hot (red) output!  
Do not use the unit near stoves,  
heat registers, radiators or other  
heat-producing devices.  
ƒ
The equipment power cord should  
be unplugged from the outlet when  
left unused for a long period of  
time.  
Power down and disconnect units  
from mains voltage before making  
connections.  
9
0
Do not drive the inputs with a  
signal level greater than that  
required to enable equipment to  
reach full output.  
 
TM  
CPX owner’s manual  
table of contents  
p.9  
how to use this manual  
1
p.10  
introduction  
p.11  
installation  
2
unpacking  
mounting  
connecting power  
cooling requirements  
operating precautions  
connecting inputs  
connecting outputs  
p.15  
features overview  
3
front panel  
rear panel  
p.22  
operation modes  
4
stereo  
parallel  
contents  
bridged mono  
p.24  
protection features  
5
GCL™ Gain Comparator Limiting  
IGM impedance sensing  
thermal protection  
short circuit  
DC voltage protection  
turn on/off protection  
AUTORAMP signal control  
p.27  
safety  
6
speaker protection  
user responsibility  
p.29  
service and support  
7
support  
contact us  
p.31  
specifications  
a
appendices  
p.32  
wire gauge charts  
b
p. ꢀ  
 
1
how to use this manual  
conventions  
terms  
official Crest Performance features and  
each indicator or control on the amplifier will appear as:terms  
actions  
specific actions or selections the user can execute will appear as:actions  
tasks  
are broken down into steps 1  
2
3
warnings  
Procedures notto attempt.  
Issues or hazards to keep in  
mind when operating  
the equipment.  
indicators  
What to look for on  
the equipment display.  
®
Alerts, indicators or  
prompts that may appear.  
tips  
Preferred methods.  
+
Helpful hints.  
Feature insights.  
see  
see—refers to other sections of the manual containing  
supplementary information on the current topic or a related issue  
note  
note—supplementary feature information  
p. 9  
 
TM  
introduction  
CPX owner’s manual  
2
welcome  
For your safety,  
read the important  
precautions section,  
as well as input,  
output and power  
connection sections.  
Congratulations on your purchase of the CPX 3800 Series,a power ampli-  
fier designed for years of reliable, flawless operation under rigorous use.  
This amplifier offers the sonic superiority and unsurpassed reliability for  
which Crest Performance is famous while remaining surprisingly compact.  
Advanced technology and extensive protection circuitry allow operation  
with greater efficiency into difficult loads and power conditions. The GCL  
(Gain Comparator Limiting)™ circuit ensures trouble-free operation into  
loads as low as 2 ohms.The Gain Comparator Limiting circuit protects  
drivers and ensures that sonic integrity is maintained even in extreme  
overload conditions.The CPX 3800’s high-efficiency design uses tunnel-  
cooled heat sinks and variable-speed DC fans. This cooling topology  
maintains a lower overall operating temperature, resulting in longer  
output transistor life. For your safety, read the important precautions  
section, as well as input, output,and power connection sections.  
Although the CPX Series amplifiers are quite simple to operate and are  
housed in ultra-strong steel chassis, improper use can be dangerous.  
This amplifier is very high powered and can put out high voltages and  
sizable currents at frequencies up to 30 kHz.Always use safe operating  
techniques when operating this amplifier.  
p. 10  
 
installation  
2
/
/
/
/
/
what to do with the shipping carton  
proper rack-mounting technique  
required AC line voltages  
unpacking  
mounting  
connecting  
power  
cooling  
requirements  
keeping the amplifier cooled  
preventing amplifier damage  
operating  
precautions  
connecting  
inputs  
connecting  
outputs  
p. 11  
 
TM  
installation  
CPX owner’s manual  
2
unpacking  
Upon unpacking, inspect the amplifier. If you find any damage, notify your supplier  
For replacement  
immediately. Only the consignee may institute a claim with the carrier for damage  
incurred during shipping. Be sure to save the carton and all packing materials. Should  
you ever need to ship the unit back to Crest Performance, one of its offices, service  
centers or the supplier, use only the original factory packing. If the shipping carton is  
unavailable,contact Crest to obtain a replacement.  
+
packaging, call Crest  
Performance’s  
Customer Service  
Department directly.  
see—service and support  
mounting  
CPX Series amplifiers will mount in standard 19" racks. Rear mounting ears are also  
provided for additional support,which is recommended in non-permanent installations  
like mobile or touring sound systems.  
connecting power  
t
CPX Series amplifier power requirements are rated at 1/8 power (typical music  
r
conditions) and 1/3 power (extreme music conditions).The maximum power cur-  
rent draw rating is limited only by the front panel circuit breaker.Consult the speci-  
fications in theAppendices section for figures on the current that each amplifier will  
demand.Make sure the mains voltage is correct and is the same as that printed on  
the rear of the amplifier.Damage caused by connecting the amplifier to improperAC  
voltage is not covered by any warranty.Unless otherwise specified when ordered,  
Crest amplifiers shipped to customers are configured as follows:  
Always turn off and  
a
disconnect the amplifier  
from mains voltage before  
making audio connections.  
Also, as an extra precaution,  
turn down the attenuators  
during power-up.  
Option 1 NorthAmerica  
Option 2 Europe, Asia  
Option 3 Australia  
120VAC / 60 Hz  
230/240VAC / 50 Hz  
240VAC / 50 Hz  
Option 4 SouthAmerica  
120VAC / 60 Hz or 240VAC / 50 Hz  
p. 12  
 
installation  
2
cooling requirements  
Make certain that there  
The CPX™ Series amplifiers use a forced-air cooling system to maintain a low, con-  
sistent operating temperature.Air is drawn into the amplifier by fan(s) on the rear  
panel, courses through the cooling fins of the tunnel-configured channel heat sink(s),  
and then exhausts through the front panel grille. If either heat sink gets too hot, its  
sensing circuit will open the output relay, disconnecting the load from that particular  
channel. The CPX 3800 utilizes one common heat sink and a single fan, but retains  
the separate circuitry. NOTE: Maintain an adequate air supply at the back of  
the amplifier and enough space around the front of the amplifier to allow  
the cooling air to escape. If the amp is rack mounted,do not use doors or covers  
on the front of the rack;the exhaust air must flow without resistance.If you are using  
racks with closed backs, use fans on the rear rack panel to pressurize the rack and  
ensure an ample air supply.  
a
is enough space around  
the front and rear of the  
amplifier to allow the  
heated air to escape.  
suggestion: In racks  
with closed backs,  
allow at least one  
standard-rack-space  
opening for every  
four mounted power  
amplifiers.  
+
operating precautions  
Make sure the mains voltage is correct and the same as that printed on the rear of the  
amplifier. Damage caused by connecting the amplifier to improper AC voltage is not  
covered by any warranty. See the Connecting Power section for more information on  
voltage requirements.  
Always turn off and  
disconnect the amplifier  
from mains voltage  
before making audio  
connections. Also, as an  
extra precaution, turn  
the attenuators down  
during power-up  
a
Although the CPX Series amplifiers have AUTORAMP circuitry, which raises the  
signal level gradually after the output relay closes,remember to have the gain controls  
turned down during power-up to prevent speaker damage if there is a high signal level  
at the inputs.Whether you buy or make them, use good-quality connections, input  
cables and speaker cables,along with good soldering technique,to ensure trouble-free  
operation.Most intermittent problems are caused by faulty cables.  
Consult the Wire Gauge Chart to determine proper gauges for different load  
impedances and cable lengths. Remember that cable resistance robs amplifier power  
2
in two ways:power lost directly to resistance (IR loss),and by increasing the total load  
impedance,thereby decreasing the power demanded of the amplifier. Also,make sure  
the mode switch is correctly set for the desired application. See Sections on Stereo,  
Parallel and Bridged Mono modes for more information.  
p. 13  
 
TM  
installation  
CPX owner’s manual  
2
connecting inputs  
Input connections are made via the three-pin XLR (pin 2+) or 6.3 mm plug “Combi”  
connectors on the rear panel of the amplifier.The inputs are actively balanced. The  
input overload point is high enough to accept the maximum output level of virtually  
any signal source.  
inputs  
outputs  
connecting outputs  
All models have two output (speaker) connections per channel. Cables can be  
connected with banana plugs,spade lugs or bare wire to the five-way binding posts.The  
®
preferred method is connection via the Speakon connectors.  
Output terminals are hazardous live and the external wiring connected to  
these terminals requires installation by an instructed person or the use of ready-  
made leads or cords.  
p. 14  
 
features overview  
3
/
/
location of connectors and controls  
legend of panel symbols  
front panel  
rear panel  
p. 15  
 
TM  
CPX owner’s manual  
features overview  
5
4
3
2
1
front panel  
switches and controls  
The power only breaks  
a
AC Power Switch/Circuit Breaker  
one side of the AC mains.  
Hazardous energy may be  
present in the enclosure  
when the power switch is in  
the OFF position.  
1
The CPX Series amplifiers have a combinationAC switch/circuit breaker  
on the front panel.If the switch shuts off during normal use,push it  
back to the ON position once.If it will not stay on,the amplifier needs  
servicing.  
Input Attenuators  
2
When operating in the bridged  
mode, both attenuators must  
be in the same position so the  
speaker load will be equally  
shared between the channels.  
See the section on Bridged  
Mono operation for more  
information and precautions.  
a
Whenever possible,set the attenuators fully clockwise to maintain  
optimum system headroom.The input attenuator controls located at the  
front panel,(one for channelA,one for channel B),adjust gain for  
their respective amplifier channels in all modes.See the specifications  
at the end of this manual for standard voltage gain and input sensitivity  
information.  
p. 16  
 
features overview  
CPX™ Series amplifiers feature three front panel LED indicators per channel:  
GCL™, SIGNAL and POWER.These LED indicators inform the user of  
each channel’s operating status and warn of possible abnormal conditions.  
3
indicators  
GCL (Gain Comparator Limting) LED  
3
A channel’s GCL LED will light at the onset of clipping. If the LEDs are  
flashing quickly and intermittently,the channel is just at the clip threshold.  
A steady, bright glow means the amp is clip limiting, or reducing gain to  
prevent severely clipped waveforms from reaching the loudspeakers. See  
the Gain Comparator Limiting section for more information. During ini-  
tial power-up the GCL LED will light to indicate that the AUTORAMP™  
gain reduction circuitry is activated. This prevents sudden signal bursts  
when the speaker relays are closed.  
Signal LED  
4
5
This LED lights when its channel produces an output signal of about 4 volts  
RMS or more (0.1 volt or more at the input,with 0 dB attenuation and  
standard x40 voltage gain). This signal indicates whether a signal is reaching  
and being amplified by the amplifier.  
Power LED  
The Power LED indicates that its channel’s output relay is closed and the  
channel is operational. It lights under normal operation and remains on, even  
when the channel is in Gain Comparator Limiting or GCL gain reduction.  
These protection features leave the output relay closed.If the Power LED goes  
off,there is no signal at the output connectors.  
p. 17  
 
TM  
features overview  
CPX owner’s manual  
3
8
6
7
9
¡
0
rear panel  
IEC Mains Connector  
6
rear panel legend  
This is a standard IEC power connector. An AC mains cord having  
the appropriate AC plug and ratings for the intended operating  
voltage is included in the carton.  
input connection  
XLR connector polarity  
TRS connector polarity  
Warning - all apparatus with class 1 construction shall be connected  
to a mains socket outlet with a protective earthing connection.  
bridged mono mode  
parallel mode  
U.S. DOMESTIC AC MAINS CORD  
The mains cord supplied with the unit is a heavy-duty, three-  
conductor type with a conventional 120VAC plug with ground  
pin. It should be connected to an independent circuit capable  
of continuously supporting at least 15 amps.This is particularly  
critical for sustained high-power applications. If the outlet used  
does not have a ground pin, a suitable grounding adapter should  
be used and the third wire grounded properly.  
stereo mode  
output connection  
®
Speakon output  
Never break off the ground pin on any equipment. It is provided for  
your safety.  
channel A stereo/parallel  
channel B stereo/parallel  
bridged mono  
The use of extension cords should be avoided but, if necessary,  
always use a three-wire type with at least a #14 AWG wire size.The  
use of lighter wire will severely limit the power capability of this  
amplifier. Always have a qualified electrician install any new  
electrical equipment.To prevent the risk of shock or fire hazard,  
always be sure that the amplifier and all associated equipment is  
properly grounded.  
five-way binding post  
channel A stereo/parallel  
NOTE: FOR U.K. ONLY  
If the colors of the wires in the mains lead of this unit do not correspond  
with the colored markings identifying the terminals in your plug,proceed as  
follows: (1) The wire that is colored green and yellow must be connected  
to the terminal that is marked by the letter E, the Earth symbol, colored  
green or colored green and yellow. (2) The wire that is colored blue must  
be connected to the terminal that is marked with the letter N or the  
color black. (3) The wire that is colored brown must be connected to the  
terminal that is marked with the letter L or the color red.  
bridged mono  
channel B stereo/parallel  
p. 1ꢀ  
 
features overview  
3
Low Cut Switch  
7
This switch is used to activate the LOW CUT filter for the corresponding  
channel.It is a push-type switch that requires a small tool to activate. The IN  
position routes the input signals through the 40 Hz LOW CUT  
filter,while the OUT position bypasses the filter. This filter will cut extremely  
low frequencies,protecting speakers from the possibility of over-excursion.  
The filter low-frequency rolloff is 12 dB per octave. The LOW CUT filter for  
each channel will function independently of the crossover function.  
Crossover Switch (100 Hz crossover)  
8
This switch is used to activate the 100 Hz crossover for the cor-  
responding channel. It is also a pushpush type switch and requires a  
small tool to activate.The CPX offers two 100 Hz crossovers.These  
are specially designed features that enhance the response of most  
loudspeakers in a typical bi-amped application. Rather than having a flat  
output curve, these crossovers use special filters to tailor the response  
and provide a flat acoustical output.This type of crossover sounds more  
natural than conventional state-variable crossovers.With the switch IN,  
the input signals are routed through the crossover and the low frequen-  
cies are automatically sent to the corresponding channel.At the same  
time, the high frequencies are sent to the HIGH OUT (9) jack and must  
then be patched to the INPUT of the other channel of this amplifier or  
to another amplifier input to complete the bi-amped system. With the  
switch OUT, the crossover is defeated and the input signal is routed  
directly to the respective power amp channel.The crossover frequency  
is fixed at 100 Hz and cannot be changed.The crossover configuration  
is a four-pole Linkwitz-Riley approximation.  
High Out Jacks  
9
This 1/4” jack supplies high-frequency output signals from the activated  
crossover for patching to this amplifier and/or additional power amplifier  
inputs. Unlike the low-frequency crossover output that is automatically  
routed to the associated channel, the high-frequency output signal must  
be patched to some suitable input in order to complete the bi-amped  
system.This 1/4” jack also provides an unbalanced (tip/sleeve) output to  
be patched with single-conductor shielded cables.  
p. 19  
 
TM  
CPX owner’s manual  
features overview  
3
Conn. Mode Select Switch  
0
Depressing the rear panel CONN. MODE select switch connects both  
input connectors together in parallel. This directs the same input signal  
to both channels and allows one connector to be used with a patch cable  
to drive another amplifier. In the OUT position, both input connectors  
operate independently. Do not operate the CONN. MODE select switch  
with the amplifier powered on. See the sections on Stereo, Parallel and  
Bridged Mono Mode for more information.  
Amp Mode Select Switch  
¡
The rear panel AMP MODE select switch determines if the amplifier is in  
stereo (two channels) or in Bridged Mono Mode. Do not operate the AMP  
MODE select switch with the amplifier powered on. See the Operations  
Mode section for more information on Stereo, Parallel and Bridged Mono  
Mode applications.  
p. 20  
 
 
TM  
CPX owner’s manual  
operation modes  
4
/
choosing the appropriate mode  
stereo  
/
switching between operation modes  
parallel  
/
special considerations when using bridged mode  
bridged mono  
p. 22  
 
operation modes  
4
stereo  
For stereo (dual channel) operation,turn the amplifier off and set the mode  
select switches on the back panel to the OUT (extended) position. In this  
mode, both channels operate independently of each other with their input  
attenuators controlling their respective levels. For example, a signal at chan-  
nelA’s input produces an amplified signal at channelA’s output,while a signal  
at channel B’s input produces an amplified signal at channel B’s output.  
parallel  
For parallel (dual channel/single input) operation, turn the amplifier off and  
set the connector mode (Conn. Mode) switch to the parallel position by  
depressing the switch.Both input connectors are then strapped together and  
drive both channels with the same input signal.Because both connectors are  
strapped together,either connector can be used with a patch cable to drive  
the input of another amplifier. Output connections are the same as in the  
Stereo Mode. In Parallel Mode, both input attenuators remain active, allow-  
ing users to set different levels for each channel. Power and other general  
performance specifications are the same as in the Stereo Mode.  
When operating in the  
Bridged Mode, both  
attenuators must be in  
the same position so  
the speaker load will be  
equally shared between  
the channels.  
bridged mono  
a
a
Both amplifier channels can be bridged together to make a very powerful  
single-channel monaural amplifier. Use extreme caution when operat-  
ing in bridged mode; potentially lethal voltage may be present  
at the output terminals. To bridge the amplifier, depress the rear panel  
Amp Mode switch (11) to the IN position. Direct the signal to channel A’s  
input and connect the speakers across pin +1 and pin +2 of the channel  
A Speakon® output connector. Only channel A’s input attenuator is active  
while in Bridged Mono mode. Both connectors are strapped together,  
so either connector can be used with a patch cable to drive the input of  
another amplifier.  
Unlike the Stereo  
and Parallel Modes, in  
which one side of each  
output is at ground, in  
the Bridged Mode both  
sides are hot. Pin +1 is  
Channel A’s side, which  
is the same polarity as  
the input.The minimum  
nominal load impedance  
in the Bridged Mode is 4  
ohms, which is equivalent  
to driving both chan-  
nels at 2 ohms. Driving  
bridged loads of less  
than 4 ohms will activate  
GCL™ circuitry, result-  
ing in a loss of power  
and potential thermal  
overload.  
p. 23  
 
TM  
CPX owner’s manual  
protection features  
5
/
description of protection features  
GCL™  
gain  
comparator  
limiting  
IGM  
impedance  
sensing  
AUTORAMP  
signal control  
thermal  
protection  
short circuit  
DC voltage  
protection  
turn on/off  
p. 24  
 
protection features  
5
The CPX Series amplifiers incorporate several circuits to protect both themselves and loud-  
speakers under virtually any situation. Crest Performance has attempted to make the amplifiers  
as foolproof as possible by making them immune to short and open circuits, mismatched loads,  
DC voltage and overheating.If a channel goes into the Gain Comparator Limiting or GCL™ gain  
reduction mode,the speaker load remains connected but clipping percentage or output power are  
instantly reduced. DC voltage on the output, excessive subsonic frequencies or thermal overload  
will cause the channel’s output relay to disconnect the speaker load until the problem is corrected  
or the amplifier cools down.  
GCL gain comparator limiting  
Any time a channel is driven into hard,continuous clipping,the GCL circuit will automatically  
reduce the channel gain to a level just slightly into clipping, guarding the speakers against the  
damaging high power continuous square waves that may be produced. Situations that may  
activate the GCL circuit include uncontrolled feedback, oscillation, an improper equipment  
setting or malfunction upstream from the amplifier.Normal program transients will not trigger  
the GCL,only steady,excessive clipping will.The GCL LED will glow brightly and continuously  
when limiting occurs.  
IGM impedance sensing  
The CPX Series amplifiers feature innovative circuitry that allows safe operation into any load.  
When an amplifier sees a load that overstresses the output stage, the Instantaneous Gain  
Modulation (IGM) circuit adjusts the channel gain to a safe level.This method of output-stage  
protection is far superior to conventional,brute force-type limiting found on other amplifiers.  
The IGM circuit is sonically transparent in normal use and unobtrusive when activated.  
thermal protection  
Internal fans keep the amplifier operating well within its intended temperature range under all  
normal conditions. If a channel’s heat sink temperature reaches 75°C, which may indicate an  
obstructed air supply, that channel will independently protect itself by disconnecting its load  
and shutting down until it has cooled. During this time,the POWER LED will go out,the GCL  
LEDs will remain lit and the cooling fans will continue running at high speed.  
short circuit  
If an output is shorted,the IGM and thermal circuits will automatically protect the amplifier.The  
IGM circuit senses the short circuit as an extremely stressful load condition and attenuates the  
signal,protecting the channel’s output transistors from over-current stress.If the short circuit  
remains,the channel will eventually thermally protect itself by disconnecting the load.  
DC voltage protection  
If an amplifier channel detects DC voltage or subsonic frequencies at its output terminals, its  
output relay will immediately open to prevent loudspeaker damage.  
p. 25  
 
TM  
protection features  
CPX owner’s manual  
5
turn-on/turn-off protection  
At power-up, the amplifier stays in the protect mode with outputs disconnected for approximately six  
seconds while the power supplies charge and stabilize. While the output relays are open, the GCL™ LEDs  
light.When power is removed, the speaker loads immediately disconnect so that no thumps or pops are  
heard.  
AUTORAMPsignal control  
Whenever a CPX Series amplifier powers up or comes out of a protect mode,theAUTORAMP circuit acti-  
vates. While the speakers are disconnected,theAUTORAMP circuit fully attenuates the signal and activates  
the GCL LED. After the output relay closes, the signal slowly and gradually raises to its set level.The PWR  
LED will illuminate and the GCL LED will turn off when the signal is no longer attenuated.TheAUTORAMP  
Signal Control circuit has some important advantages over conventional instant-on circuits:  
1. If a signal is present during power-up (or when coming out of protect), the speakers are  
spared a sudden,potentially damaging burst of audio power.  
2. Because the gain is reduced until after the output relay closes, no arcing occurs at the  
contacts.This extends the contacts’ useful life.  
p. 26  
 
safety  
6
/
/
protecting your speakers  
speaker  
protection  
the owner’s role in amplifier safety  
user  
responsibility  
p. 27  
 
TM  
safety  
CPX owner’s manual  
6
speaker protection  
All loudspeakers have electrical,thermal and physical limits that must be observed to prevent  
damage or failure. Too much power,low frequencies applied to high frequency drivers,severely  
clipped waveforms and DC voltage can all be fatal to cone and compression drivers.The  
Crest Performance CPX Series amplifiers automatically protect speakers from DC voltages  
and subsonic signals. For more information, see the section on Protection Features. Mid- and  
high-frequency speakers,especially compression drivers,are highly susceptible to damage from  
overpowering, clipped waveforms or frequencies below their rated pass band. Be extremely  
careful that the low and mid bands of an electronic crossover are connected to the correct  
amplifiers and drivers and not accidentally connected to those for a higher frequency band.  
The amplifier’s clipping point is its maximum peak output power and can deliver more power  
than many speakers can safely handle.Be sure the peak power capability of the amplifier is not  
excessive for your speaker system.  
To ensure that the speakers never receive excessive power and that the amplifier never clips,  
use a properly adjusted external limiter (or a compressor with a ratio of 10:1 or higher) to  
control power output.In systems with active electronic crossovers,use one for each frequen-  
cy band.The clip limiter will automatically limit the duration of continuous square waveforms  
applied to the speakers.The amplifier will, however, allow normal musical transient bursts to  
pass. Some speaker systems are packaged with processors that have power limiting circuits  
and should not require additional external limiting.  
Fuses may also be used to limit power to speaker drivers,although as current-limiting (rather  
than voltage-limiting) devices they are an imperfect solution. As the weakest links, fuses only  
limit once before needing replacement. Some poor-quality fuses have a significant series  
resistance that could degrade the amplifier’s damping of the speaker’s motion and may even  
deteriorate the system’s sound quality.If you elect to use fuses,check with the speaker manu-  
facturer to determine the proper current rating and time lag required.  
Do not drive any low-frequency speaker enclosure with frequencies lower than its own tuned  
frequency. The reduced acoustical damping could cause a ported speaker to bottom out even  
at moderate power. Consult the speaker system specifications to determine its frequency  
limits.  
amplifier maintenance and user responsibility  
A CPX Series amplifier requires no routine maintenance and should never need any  
internal adjustment during its lifetime.Your CPX Series amplifier is very powerful and can  
be potentially dangerous to loudspeakers and humans alike. It is your responsibility to  
read the Important Precautions section in the front of this manual and to make sure that  
the amplifier is installed, wired and operated properly. Many loudspeakers can be easily  
damaged or destroyed by overpowering, especially with the high power available from a  
bridged amplifier.Read the Speaker Protection section and always be aware of the speaker’s  
continuous and peak power capabilities.  
p. 2ꢀ  
 
service and support  
7
/
/
when to get support  
support  
ways to contact Crest Performance  
contact us  
p. 29  
 
TM  
service and support  
CPX owner’s manual  
7
support  
Because of the complexity  
of the design and the risk of  
electrical shock, all repairs  
must be performed by  
In the unlikely event that your amplifier develops a problem, it must be  
+
returned to an authorized distributor or service center or shipped directly  
to our factory for service.  
a
qualified technical personnel  
only. If the unit needs to  
To obtain service, contact your nearest Crest Performance Service Center,  
Distributor, Dealer or any of the worldwide Crest Performance offices. For  
those with Internet access,please visit the Crest Performance web site.  
be shipped back to the factory, it  
must be sent in its original carton.  
If improperly packed, your amplifier  
may be damaged.  
contact us  
customer service  
phone 601.486.2000 USA  
fax  
601.486.1380 USA  
email customerserve@crestaudio.com  
technical support  
phone 601.486.2000 USA  
fax  
601.486.1380 USA  
email techserve@crestaudio.com  
web site  
For replacement  
packaging, call Crest  
Performance’s  
+
Customer Service  
mail  
Crest Performance Inc.  
5022 Hwy.493 North  
Meridian,MS 39305 USA  
p. 30  
 
a
specifications  
TM  
CPX Series  
CPX 3800  
2650 watts @ 1 kHz at <0.1% T.H.D.  
Rated Power Bridged 8 ohms  
1300 watts per channel @ 1 kHz at <0.05% T.H.D. both channels driven  
775 watts per channel @ 1 kHz at <0.05% T.H.D. both channels driven  
Rated Power (2 x 4 ohms)  
Rated Power (2 x 8 ohms)  
1500 watts @ 1 kHz at <0.05% T.H.D.  
875 watts @ 1 kHz at <0.05% T.H.D.  
4 ohms  
Rated Power (1 x 4 ohms)  
Rated Power (1 x 8 ohms)  
Minimum Load Impedance  
Maximum RMS Voltage Swing  
Frequency Response  
93 volts  
10 Hz - 100 kHz; +0, -2 dB at 1 watt  
10 Hz - 35 kHz; +0, -3 dB at rated 4 ohm power  
<0.1% @ 1050 watts per channel from 20 Hz to 20 kHz  
Power Bandwidth  
T.H.D. (2 x 4 ohms)  
<0.1% @ 700 watts per channel from 20 Hz to 20 kHz  
T.H.D. (2 x 8 ohms)  
>- 55 dB @ 1 kHz  
Input CMRR  
Voltage Gain  
Crosstalk  
x40 (32 dB)  
> -55 dB @ 1 kHz at rated power @ 8 ohms  
> -108 dB, “A” weighted reference to rated power @ 8 ohms  
Hum and Noise  
> 15V/us  
Slew Rate  
> 500:1 @ 20 Hz - 1 kHz  
Damping Factor (8 ohms)  
Phase Response  
+5 to - 12 degrees from 20 Hz to 20 kHz  
1.8 volts +/- 3% for 1 kHz, 4 ohm rated power  
Input Sensitivity (x40)  
15 k ohms, balanced  
Input Impedance  
1185 watts @ 4 ohms  
720 watts @ 8 ohms  
Current Draw @ 1/8 Power  
2975 watts @ 4 ohms  
1835 watts @ 8 ohms  
Current Draw @ 1/3 Power  
Two front panel temperature dependent variable speed 80 mm DC fans  
2 front panel attenuators, rear panel Mode switches  
Cooling  
Controls  
2 GCL (gain comparator limiting), 2 Signal presence, 2 Active Status  
Thermal, DC, turn-on bursts, subsonic, incorrect loads  
Indicator LEDs  
Protection  
Connectors  
Per channel, Combi XLR & 6.3 mm phone input, Speakon® and Binding Post speaker  
output, 15 amp IEC mains connector  
14 ga. steel with cast front panel and cast handles  
Construction  
Dimensions  
88.9 mm x 482.6 mm x 376.3 mm + 31.8 for rear support ears and connectors  
(3.5" x 19" x 14.81" + 1.25”) + 38.1 mm (1.5”) handle depth  
19.5 kg (43 lbs)  
Net Weight  
20.6 kg (45.5 lbs)  
Gross Weight  
All power measurements made at 120 VAC, power transformer cold. 4 ohm power is time limited by magnetic circuit breaker.  
All power measurements made at 120 VAC, power transformer cold, 2 ohm power is time limited by magnetic circuit breaker  
p. 31  
 
TM  
b service and support  
CPX owner’s manual  
standard  
wire gauge  
(AWG)  
power loss into power loss into power lossinto  
cable length (in feet)  
8Ω load (%)  
4Ω load (%)  
2Ω load (%)  
feet  
18  
16  
14  
12  
10  
18  
16  
14  
12  
.79  
1.58  
3.16  
2.00  
1.24  
.80  
5
.50  
1.00  
.62  
.31  
.20  
.40  
.125  
1.58  
1.00  
.62  
.25  
.50  
feet  
3.16  
2.0  
6.32  
4.00  
2.50  
1.60  
10  
1.25  
.80  
.40  
10  
18  
.25  
.50  
1.00  
feet  
8.00  
12.60  
25.20  
40  
16  
14  
12  
10  
8
4.00  
2.50  
1.60  
1.00  
.625  
8.00  
5.00  
3.20  
2.00  
8.00  
5.00  
3.20  
2.00  
1.25  
16.00  
10.00  
6.40  
4.00  
1.60  
10.00  
6.40  
4.00  
2.50  
feet  
16  
14  
12  
10  
32.00  
20.00  
12.80  
8.00  
80  
p. 32  
 
c
setup  
glossary of terms  
(for setup)  
Stereo  
Music with two separate channels, usually a left and right  
channel.  
Mono  
Music with only one channel.  
Crossover  
An electronic device that separates high and low  
frequencies and sends them to different outputs. The sepa-  
rate signals are usually sent to a high out and a low out.  
Bi-amp  
The separation of high and low frequencies with a cross-  
over, using separate speakers and power amps for each.  
Full Range Both high and low frequencies together in a single channel.  
Program  
Hi-Pass  
The signal that is plugged into the amplifier.  
Allows only the high frequencies to pass, blocking the low  
frequencies.  
Low-Pass  
Mid/High  
Allows only the low frequencies to pass, blocking the high  
frequencies.  
The speaker designed to play everything but the low  
frequencies.  
Sub  
The speaker designed for low frequencies only.  
Parallel  
Both speakers or inputs have the same signal. When  
referring to speakers, this means plugging the second  
speaker into the first speaker and so on.  
p. 33  
 
NOTES  
 
CREST AUDIO LIMITED WARRANTY  
Effective Date: November 1, 2000  
What This Warranty Covers  
Your Crest Audio Warranty covers defects in material and workmanship in Crest Audio products purchased and serviced in the U.S.A.  
What This Warranty Does Not Cover  
The Warranty does not cover: (1) damage caused by accident, misuse, abuse, improper installation or operation, rental, product modification or neglect; (2) damage  
occurring during shipment; (3) damage caused by repair or service performed by persons not authorized by Crest Audio; (4) products on which the serial number  
has been altered, defaced or removed; (5) products not purchased directly from Crest Audio or from an Authorized Crest Audio Dealer.  
Who This Warranty Protects  
This Warranty protects only the original purchaser of the product.  
How Long This Warranty Lasts  
The Warranty begins on the date of purchase by the original retail purchaser. The duration of the Warranty is as follows:  
Product Category  
Amplifiers  
Duration  
5 years  
Consoles  
5 years  
Signal Processing  
Enclosures  
2 years *(+1 year)  
3 years *(+2 years)  
2 years *(+2 years)  
“Crest Performance”  
[*Denotes additional warranty period applicable if optional Warranty Registration Card is completed and returned to Crest Audio by original purchaser within 90 days of purchase.]  
[**Denotes all products sold under the “Crest Performance” brand including amplifiers, consoles, signal processing, enclosures and any other product  
category.]  
What Crest Audio Will Do  
We will repair or replace (at Crest Audio’s discretion) products covered by warranty at no charge for labor or materials. If the product or component must be  
shipped to Crest Audio for warranty service, the consumer must pay initial shipping charges. If the repairs are covered by warranty, Crest Audio will pay the return  
shipping charges.  
How To Get Warranty Service  
(1) Take the defective item and your sales receipt or other proof of date of purchase to your Authorized Crest Audio Dealer or Authorized Crest Audio Service  
Center. OR  
(2) Ship the defective item, prepaid, to Crest Audio, 412 Highway 11 & 80 East, Meridian, MS 39301. Include a detailed description of the problem, together with a  
copy of your sales receipt or other proof of date of purchase as evidence of warranty coverage. Also provide a complete return address.  
Limitation of Implied Warranties  
ANY IMPLIED WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE,ARE LIMITED IN  
DURATION TO THE LENGTH OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not  
apply to you.  
Exclusions of Damages  
CREST AUDIO’S LIABILITY FOR ANY DEFECTIVE PRODUCT IS LIMITED TO THE REPAIR OR REPLACEMENT OF THE PRODUCT,AT CREST AUDIO’S  
OPTION. IF WE ELECT TO REPLACE THE PRODUCT,THE REPLACEMENT MAY BE A RECONDITIONED UNIT. CREST AUDIO SHALL NOT BE LIABLE FOR  
DAMAGES BASED ON INCONVENIENCE, LOSS OF USE, LOST PROFITS, LOST SAVINGS, DAMAGE TO ANY OTHER EQUIPMENT OR OTHER ITEMS AT THE  
SITE OF USE, OR ANY OTHER DAMAGES WHETHER INCIDENTAL, CONSEQUENTIAL OR OTHERWISE, EVEN IF CREST AUDIO HAS BEEN ADVISED OF  
THE POSSIBILITY OF SUCH DAMAGES. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or  
exclusion may not apply to you.  
This Warranty gives you specific legal rights, and you may also have other rights which vary from state to state.  
If you have any questions about this warranty or service received or if you need assistance in locating an Authorized Service Center, please contact Crest Audio at  
(201) 909-8700 and ask for the service department.  
Features and specifications subject to change without notice.  
#80304822  
Logo referenced in Directive 2002/96/EC Annex IV  
(OJ(L)37/38,13.02.03 and defined in EN 50419: 2005  
The bar is the symbol for marking of new waste and  
is applied only to equipment manufactured after  
13 August 2005  
 
http://www.crest-performance.com CPXTM Owner's Manual 01/18/2006  
80303153  
 

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