CPX owner’s manual S E R I E S CPX power amplifier 20 20 23 26 16 6 29 (dB) 32 A PWR SIG B GCLTM GCLTM SIG CPX 900 CPX 1500 CPX 2600 23 6 PWR ON 26 16 29 (dB) 32 CPX 2600 POWER AMPLIFIER POWER
important precautions 1 Save the carton and packing materials! Should you ever need to ship the unit, use only the original factory packing. Do not run the output of any amplifier channel back into another channel’s input. For replacement packaging, call Crest Audio’s Customer Service Department directly. Do not parallel- or series-connect an amplifier output with any other amplifier output. 2 Read all documentation before operating your equipment. Retain all documentation for future reference.
CPX Owner’s manual 1 2 installation 3 features overview 4 introduction p.3 p.5 unpacking mounting cooling and ventilation powering maintenance p.11 front panel rear panel contents application details p.23 installations bridged GCL 5 connections 6 Specifications p.31 wire gauge charts p.27 input output p.32, 33 p.
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introduction 1 welcome Congratulations on your purchase of a new CPX Series power amplifier, and thank you for your confidence in Crest Audio products. You are among the growing number of audio professionals who have made Crest Audio one of the world’s leading suppliers of professional and commercial/industrial audio systems. For your safety, please read the Important Precautions section before installing and operating the amplifier.
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installation what to do with the shipping carton 2 unpacking proper rack-mounting technique keeping the amplifier cooled mounting routine maintenance practices cooling and ventilation maintenance p.
2 installation CPX owner’s manual unpacking Please inspect the amplifier carefully immediately after unpacking. If you find any damage, notify your supplier/dealer immediately. Only the shipper may file a damage claim with the carrier for damage incurred during shipping. Be sure to save the carton and all packing materials for the carrier’s inspection. If the packing materials are in good condition, please save them.
installation 2 mounting All CPX Series amplifiers mount in standard 19-inch racks and occupy two rack spaces. Use of rear supports is highly recommended in all mobile and touring sound systems. CPX Front panel front height 3.
2 installation CPX owner’s manual INSTALLATION CPX professional power amplifiers are designed for durability in commercial installations and provide the quality performance required in studio and home applications. They are 2-rack-space units of 16" (406 mm) depth designed to mount in a standard 19" rack. Rear mounting ears are provided for additional support. The minimum rack depth required from the mounting surface is 17" (432 mm) to allow adequate connector clearance.
installation 2 Basic setup Rack mount the amplifier in the location where it is to be used, remembering to allow for adequate access and cooling space. Make all the connections to the proper INPUT connectors on the desired channel. Select the proper mode configuration (STEREO or BRIDGE). Connect speakers to the proper OUTPUT connectors, reviewing carefully the impedance and phase considerations.
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features overview location of connectors and controls 3 front panel Descriptions of connectors and controls rear panel p.
3 features overview CPX owner’s manual CPX Front panel 5 1 2 3 4 20 23 20 26 16 6 29 (dB) p.
features overview 3 front panel 1 Channel Level attenuators Two input attenuators adjust level for their respective amplifier channels. In Bridged Mono and Parallel modes, the channel A attenuator controls overall signal level (see rear panel mode switch description). 2 Power LEDs (PWR) These indicators illuminate when the AC mains power is being supplied to the amp and both channels are operational.
3 features overview CPX owner’s manual CPX Rear Panel 7 CAUTION CHANNEL A INPUT CHANNEL A BRIDGE LOW CUT WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR. 150 Hz X OVER + - p. 14 + 8 CHANNEL B OUTPUT - MOUNT IN RACK ONLY - INSTALLER SUR SUPPORT DE MONTAGE SEULEMENT CHANNEL A GCL TM OUT ENABLE / IN DEFEAT THRU HIGH OUT LOW OUT LOW CUT BAL.
features overview 3 rear panel 7 Circuit breaker There is one circuit BREAKER on the CPX amplifier. This breaker is provided to limit current to the associated power transformer, and protect it from overheating and possible destruction due to fault conditions in the unit. The trip current values have been carefully chosen to allow reasonable continuous power output performance, while still protecting the power transformer.
3 features overview CPX owner’s manual CPX Rear Panel 11 10 CAUTION CHANNEL A INPUT CHANNEL A BRIDGE LOW CUT TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR. 150 Hz X OVER + + - CHANNEL B OUTPUT 9 p. 16 - MOUNT IN RACK ONLY - INSTALLER SUR SUPPORT DE MONTAGE SEULEMENT CHANNEL A GCL TM OUT ENABLE / IN DEFEAT A LOW CUT BAL.
features overview 3 rear panel 9 Binding post outputs Shockproof binding post speaker outputs are provided on the CPX amplifier. For each channel, the outputs are in parallel and the speaker connection cables can be terminated with banana plugs or stripped wires for use in the binding post terminals, or can be connected using the Speakon outputs (9). For sustained high-power applications, either outputs can be used; however, exercise care to assure the correct speaker phasing.
3 features overview CPX owner’s manual CPX Rear Panel CAUTION CHANNEL A INPUT CHANNEL A BRIDGE LOW CUT TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR. 150 Hz X OVER BRIDGE OUT STEREO/ IN BRIDGE - + + OUTPUT BAL. LOW Z GND HIGH Z B 150 Hz X OVER CHANNEL A CHANNEL B INPUT - 12 p.
features overview 3 rear panel 12 GCL (Gain Comparator Limiter) switch This switch is used to enable or defeat the GCL limiter circuitry. It is also a conventional push-push type, requiring a small "tool" to activate. The IN position is DEFEAT; the OUT position is ENABLE. Normally, the GCL function should be enabled to minimize the possibility of either or both channels going into clipping or overload. With this feature defeated, a severe overload could cause the mains circuit breaker to trip.
3 features overview CPX owner’s manual CPX Rear Panel 16 CAUTION CHANNEL A INPUT CHANNEL A BRIDGE LOW CUT TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR. 150 Hz X OVER + + - CHANNEL B OUTPUT - MOUNT IN RACK ONLY - INSTALLER SUR SUPPORT DE MONTAGE SEULEMENT THRU HIGH OUT LOW OUT GCL TM OUT ENABLE / IN DEFEAT BAL. LOW Z GND HIGH Z 150 Hz X OVER CHANNEL A CHANNEL B INPUT 17 19 18 p.
features overview 3 rear panel 16 Low cut switch This switch is used to activate the LOW CUT filter for the corresponding channel. It is again a push-push type switch, requiring 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.
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Application details 4 Industrial & commercial installations For commercial and other installations where sustained high power operation is required, the amplifiers should be mounted in a standard 19" rack. It is not necessary to leave a rack space between each amplifier in the stack since each fan pulls air in from the rear and exhausts the hot air out the front. However, an adequate cool air supply must be provided for the amplifier when rack mounted.
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Application details 4 Industrial & commercial installations GCL Crest's patented GCL (Gain Comparator Limiting) circuit enables the sound technician to maximize the performance of the amplifier/speaker combination by preventing the power amplifier from running out of headroom (clipping). This limiting system is activated by a unique circuit that senses signal conditions that might overload the amplifier and activates compression (reduces the channel gain) when clipping is imminent.
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connections 5 AMPLIFIER CONFIGURATIONS BASIC FULL-RANGE STEREO SYSTEM L & R THRU Outputs Right Full-range Speaker(s) Left Full-range Speaker(s) L&R Inputs MONO BI-AMPED SYSTEM 1 2 ¼” Tip/Sleeve Patch Cord Full-range Speakers Sub Speakers Mono Input Push-Push Switch Activation List: 1 - Chan A, Low Cut Switch IN 2 - Chan A, 150 Hz Xover Switch IN p.
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connections 5 STEREO BI-AMPED SYSTEM 1 2 3 4 ¼” Tip/Sleeve Patch Cords Right Full-range Speaker(s) Left Full-range Speaker(s) Right Sub Speaker(s) L&R Inputs Push-Push Switch Activation List: 1 - Chan A Low Cut Switch IN 2 - Chan A 150 Hz Xover Switch IN 3 - Chan B Low Cut Switch IN 4 - Chan B 150 Hz Xover Switch IN Left Sub Speaker(s) BRIDGE CONFIGURATION 2 Sub Speaker(s) 1 Mono Input Push-Push Switch Activation List: 1 - Chan A, Low Cut Switch IN 2 - Mode Switch IN (Bridge) p.
specifications p.
Specifications CPX 900 CPX 1500 CPX 2600 450 W RMS/chan 300 W RMS/chan 180 W RMS/chan 750 W RMS/chan 500 W RMS/chan 300 W RMS/chan 1300 W RMS/chan 900 W RMS/chan 540 W RMS/chan RATED OUTPUT POWER: Stereo mode (EIA both channels driven) 2 ohms EIA, 1 kHz, 1% THD 4 ohms EIA, 1 kHz, 0.1% THD 8 ohms EIA, 1 kHz, 0.1% THD Bridge mode, mono 4 ohms EIA, 1 kHz, 1% THD 8 ohms EIA, 1 kHz, 0.
wire gauge CPX owner’s manual stranded cable length 2 5 meters meters 10 30 p. 32 wire gauge power loss 0.3mm2 8 Ohm load 2.9% 4 Ohm load 2 Ohm load 0.5 1.74 3.4 6.7 0.75 1.16 2.3 4.5 1.5 0.58 1.16 2.3 2.5 0.35 0.70 1.39 4.0 0.22 0.44 0.87 0.5mm2 4.3% 8.2% 15.5% 0.75 2.9 5.6 10.8 1.5 1.45 2.9 5.6 2.5 0.87 1.74 3.4 4 0.55 1.09 2.2 6 0.37 0.73 1.45 8.24% 5.5% 28% 0.75 5.6 10.8 19.9 1.5 2.9 5.6 10.8 2.5 1.74 2.9 6.7 4 1.09 1.74 4.
wire gauge stranded cable length 5 feet 10 40 80 feet feet feet wire gauge power loss 18 AWG 8 Ohm load 0.81% 4 Ohm load 2 Ohm load 16 0.51 1.02 2.0 14 0.32 0.64 1.28 12 0.20 0.40 0.80 10 0.128 0.25 0.51 18 AWG 1.61% 3.2% 6.2% 16 1.02 2.0 4.0 14 0.64 1.28 2.5 12 0.40 0.80 1.60 10 0.25 0.51 1.01 18 AWG 6.2% 11.9% 22% 16 4.0 7.7 14.6 14 2.5 5.0 9.6 12 1.60 3.2 6.2 10 1.01 2.0 4.0 8 0.60 1.20 2.4 18 AWG 11.9% 22% 37% 16 7.7 14.
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