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™
PROFESSIONAL
POWER AMPLIFIERS
OWNER’S MANUAL
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Intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. Intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product. CAUTION: Risk of electrical shock — DO NOT OPEN! CAUTION: To reduce the risk of electric shock, do not remove cover. No user serviceable parts insi
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IMPORTANT SAFETY INSTRUCTIONS WARNING: When using electrical products, basic cautions should always be followed, including the following: 1. Read these instructions. 2. Keep these instructions. 3. Heed all warnings. 4. Follow all instructions. 5. Do not use this apparatus near water. 6. Clean only with a dry cloth. 7. Do not block any of the ventilation openings. Install in accordance with manufacturer’s instructions. 8. Do not install near any heat sources such as radiators, heat registers,
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WICHTIGE SICHERHEITSHINWEISE ACHTUNG: Beim Einsatz von Elektrogeräten müssen u.a. grundlegende Vorsichtsmaßnahmen befolgt werden: 1. Lesen Sie sich diese Anweisungen durch. 2. Bewahren Sie diese Anweisungen auf. 3. Beachten Sie alle Warnungen. 4. Befolgen Sie alle Anweisungen. 5. Setzen Sie dieses Gerät nicht in der Nähe von Wasser ein. 6. Reinigen Sie es nur mit einem trockenen Tuch. 7. Blockieren Sie keine der Lüftungsöffnungen. Führen Sie die Installation gemäß den Anweisungen des Herstelle
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INSTRUCTIONS IMPORTANTES DE SECURITE ATTENTION: L’utilisation de tout appareil électrique doit être soumise aux precautions d’usage incluant: 1. Lire ces instructions. 2. Gardez ce manuel pour de futures références. 3. Prétez attention aux messages de précautions de ce manuel. 4. Suivez ces instructions. 5. N’utilisez pas cette unité proche de plans d’eau. 6. N’utilisez qu’un tissu sec pour le nettoyage de votre unité. 7. N’obstruez pas les systèmes de refroidissement de votre unité et instal
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INSTRUCCIONES IMPORTANTES PARA SU SEGURIDAD CUIDADO: Cuando use productos electrónicos, debe tomar precauciones básicas, incluyendo las siguientes: 1. Lea estas instrucciones. 2. Guarde estas instrucciones. 3. Haga caso de todos los consejos. 4. Siga todas las instrucciones. 5. No usar este aparato cerca del agua. 6. Limpiar solamente con una tela seca. 7. No bloquear ninguna de las salidas de ventilación. Instalar de acuerdo a las instrucciones del fabricante. 8. No instalar cerca de ninguna fu
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Intr oduction E NG LI S H ™ CM Series power amplifiers feature a unique amplification architecture providing a host of user benefits including simplified operation and use in multiple applications, as well as unsurpassed sonic quality and flexible power. Easy to Use The CM 2204-AB (US model)/CM 2204-DV (European model) and CM 2208-AB (US model)/CM 2208-DV (European model) are easy to set up and operate. Housed in a lightweight-but-rugged 16-gauge steel chassis, multi- load architecture all
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Intr oduction Unpacking Upon unpacking, inspect the amplifier. If you find any damage, notify your supplier 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 Audio, one of its offices, service centers or the supplier, use only the original factory packing. If the shipping carton is unavailable, contact Crest Audio to obtain a re
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Operating Pr ecautions 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 improper AC voltage is not covered by any warranty. Note: Always turn off and disconnect the amplifier from mains voltage before making audio connections. Also, as an extra precaution, turn down the attenuators before powering up. It is always a good idea to have the gain controls turned down while powering up to prevent
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F r ont P anel 1 2 3 1 2 3 (1) P o w er Indicator The green LED indicates that AC power is supplied to the unit and the power switch is ON. (2) Signal Indicators Green LEDs indicate significant signal presence on that channel output. The Signal Indicator illuminates only when an output signal is 1 Watt or higher (at 70V). Therefore, it is possible to have an acceptably strong signal without the Signal Indicator illuminating. (3) Clip Indicators The Clip Indicator LED illuminates
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F r ont P anel 4 6 5 4 6 5 (4) Pr otect Indicators Upon powering up the unit, the Protect LEDs illuminate momentarily and then turn off one channel at a time and then remain off. During normal operation, an over-current condition can occur if the amplifier is being overdriven to the point where clipping is continuous or from a short circuit in the speaker output. The Protect LED will illuminate red when one of these conditions occurs. ™ The internal temperature of CM Series amplifier
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Rear P anel 7 8 HPF HPF -6 -6 -6 -6 Ch 1 Inputs 7 - 0dB - 0dB - 0dB - 0dB Ch 2 x40 x40 x40 x40 Gain Gain Gain Gain 0dB 0dB 0dB 0dB Ch 3 Ch 4 Ch 3 Ch 2 Ch 1 WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC CAUTION SHOCK, THIS APPARATUS SHOULD NOT BE EXPOSED TO RAIN OR Ch 4 Output Power per Channel Designed and manufactured in the USA by: RISK OF ELECTRIC SHOCK MOISTURE AND OBJECTS FILLED WITH LIQUIDS, SUCH AS VASES, Crest Audio, Inc. DO NOT OPEN SHOULD NOT BE PLACED ON THIS APPARATUS. 220 Watts @
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-6 Inputs - 0dB x40 Gain 0dB Ch 4 -6 Inputs - 0dB x40 Gain 0dB Ch 4 Rear P anel 9 9 HPF HPF -6 -6 -6 -6 Ch 1 Inputs - - - - Ch 2 0dB 0dB 0dB 0dB x40 x40 x40 x40 Gain Gain Gain Gain Ch 3 0dB 0dB 0dB 0dB Ch 4 Ch 3 Ch 2 Ch 1 WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC CAUTION SHOCK, THIS APPARATUS SHOULD NOT BE EXPOSED TO RAIN OR Ch 4 Output Power per Channel Designed and manufactured in the USA by: MOISTURE AND OBJECTS FILLED WITH LIQUIDS, SUCH AS VASES, RISK OF ELECTRIC SHOCK SHOULD NOT BE P
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Rear P anel 10 11 12 10 HPF HPF -6 -6 -6 -6 Ch 1 Inputs - - - - Ch 2 0dB 0dB 0dB 0dB x40 x40 x40 x40 11 Gain Gain Gain Gain Ch 3 0dB 0dB 0dB 0dB Ch 4 Ch 3 Ch 2 Ch 1 12 WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC CAUTION SHOCK, THIS APPARATUS SHOULD NOT BE EXPOSED TO RAIN OR Ch 4 Output Power per Channel Designed and manufactured in the USA by: MOISTURE AND OBJECTS FILLED WITH LIQUIDS, SUCH AS VASES, RISK OF ELECTRIC SHOCK SHOULD NOT BE PLACED ON THIS APPARATUS. 220 Watts @ 70.7 V Crest Audi
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GND input - input + input Bridg ed Mode A pair of amplifier channels may be bridged together to make a single output with a power rating equal to the sum of both channel power ratings at twice the load rating of a single channel. In other words‚ bridging two amplifiers rated for 160 Watts into 4 Ohms will produce 320 Watts into 8 Ohms. In Bridged Mode‚ the channels operate at opposite polarity from each other so that one channel pushes and the other pulls equally. This mode sends the inp
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Outputs in Bridg ed Mode The loudspeaker load is connected only to the designated positive (+) output terminals of the bridged channels. NEVER ground either side of the loudspeaker load cable when the amplifier is in Bridged Mode as both sides are “hot.” If an output patch panel is used‚ all connections must be isolated from each other and from the panel. When using the low-Z output‚ the minimum nominal load impedance in Bridged Mode is 8 Ohms; this is equivalent to driving both bridged
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8 speakers @ 25 Watts each = 200 Watts + + - + - + - + - + - + - + - + - + - Example of a 70 V olt constant-v olta g e distribution system 20 speakers @ 10 Watts each = 200 Watts + - + - + - + - + + 70 V Line - Ch1 - + + - Ch2 70 V Line + - - + + Low Z or Ch 3 - - 70 V Line + - Low Z or + Ch4 70 V Line - Outputs Class 2 Wiring 1 + -- + - + - + - + + + + + - + - + - + - + - - + -
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SPECIFICA TIONS ™ Specification CM 2208 CM 2204 Non-Bridg ed Mode Rated Power (one channel driven) 4 Ohms 160 Watts 160 Watts 8 Ohms 240 Watts 245 Watts 70 Volts (24 Ohms) 230 Watts 220 Watts Rated Power (all channels driven) 4 Ohms 150 Watts 155 Watts 8 Ohms 210 Watts 240 Watts 70 Volts (24 Ohms) 170 Watts 180 Watts Minim um Load Impedance 4 Ohms 4 Ohms Bridg ed Mode Rated Power (one channel driven) 8 Ohms 320 Watts 320 Watts 140 Volts 460 Watts 440 Watts Rated Po wer (all channels dr
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SPECIFICA TIONS ™ Specification CM 2208 CM 2204 Curr ent Consumption (Multiply current by 0. for 20 V units) 1/3 power, 70 V output 8.0 A 4.4 A 1/8 power, 70 V output 4.0 A 2.3 A Idle <2 A <1 A Thermal Emission 1/8 power, 70 V output 724 BTU/hr 473 BTU/hr 1/3 power, 70 V output 947 BTU/hr 621 BTU/hr Contr ols Front: AC switch CM 2204, Rear: 4 channel input signal attenuators‚ 4 channel HPF select switches, 4 channel gain select switches CM 2208, Rear: 8 channel input signal att
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SER VICE AND SUPPOR T Suppor t 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. To obtain service, contact your nearest Crest Audio Service Center, Distributor, Dealer or any of the worldwide Crest Audio offices (available online at www.crestaudio.com). Contact Us Customer Ser vice phone 201.475.4600 USA email custsrv@crestaudio.com T echnical Suppor t phone 201.475.4600
