PROFESSIONAL POWER AMPLIFIERS 7301 Professional Power Amplifier Clip/Limit 10004 Professional Power Amplifier Signal Temp/DC Active -6 -10 -6 -3 -10 -15 -3 -15 -1 -30 -80 -1 -30 0dB -80 LOWS -6 -3 -10 -15 -1 -80 -80 0dB -6 -10 -3 -80 -1 -30 -80 0dB 0dB -1 -30 -80 0dB Ch D Ch C Ch B -3 -15 -15 -1 -30 0dB Ch A -1 -30 -80 Ch A -10 -3 -15 -1 -30 -3 -6 -6 -10 -3 -15 -30 Active -6 -10 -15 Active -10 Signal Temp/DC Active Signal Temp/DC -6 Signal Temp/
Important Precautions This symbol is used to alert the operator to follow important operating procedures and precautions detailed in documentation. This symbol is used to warn operators that uninsulated “dangerous voltages” are present within the equipment enclosure that may pose a risk of electric shock. 1. Save the carton and packing material even if the equipment has arrived in good condition. Should you ever need to ship the unit, use only the original factory packing. 2.
Power Amplifier Owner’s Manual Table of Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Cooling Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 3 Operating Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . 3 Crest Audio Model 7301 Power Amplifier . . . . . . . . . .
Introduction Congratulations...on your purchase of a Crest Audio Professional Series power amplifier. Designed for years of reliable, flawless operation under rigorous use. These power amplifiers offer the sonic superiority and unsurpassed reliability for which Crest Audio is famous, while remaining surprisingly compact. Advanced technology and extensive protection circuitry allow operation with greater efficiency into difficult loads and power conditions.
Cooling Requirements The Professional Series amplifiers use a forced-air cooling system to maintain a low, even operating temperature. Air is drawn into the amplifier by fan(s) on the rear panel, courses through the cooling fins of the back-to-back (tunnel-configured) channel heat sinks, and then exhausts through the front panel slots. If either heat sink gets too hot, its sensing circuit will open the output relay, disconnecting the load from that particular channel.
Models 3301, 4801, 6001 Features 1 2 3 3301 Professional Power Amplifier Clip/Limit Signal Temp/DC Active -6 -10 -6 -3 -10 -15 -3 -15 -1 -30 -80 -1 -30 0dB -80 Ch A 0dB Ch B 4 5 6 7 9 8 10 CAUTION AVIS : RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR A + BRIDGE -- WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
Model 7301 Features 1 2 3 7301 Professional Power Amplifier Clip/Limit Signal Temp/DC Active -6 -10 -3 -15 -3 -15 -1 -30 -80 -1 -30 0dB -80 LOWS 4 -6 -10 0dB HIGHS 5 6 7 8 CAUTION 9 OUT LOWS RISK OF ELECTRIC SHOCK DO NOT OPEN LOWS AVIS : RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
Model 8001 Features 2 1 3 8001 Professional Power Amplifier Clip/Limit Signal Temp/DC Active -6 -10 -6 -10 -3 -15 -1 -30 -80 5 PUSH IN B 6 PUSH IN -1 -30 -80 0dB Ch A 4 -3 -15 0dB Ch B 7 8 9 A CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN AVIS : RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR -OUT A + -OUT A + WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
Model 9001 Features 2 1 3 9001 Professional Power Amplifier Clip/Limit Signal Temp/DC Active -6 -10 -6 -10 -3 -15 -1 -30 -80 5 -1 -30 -80 0dB Ch A 4 -3 -15 0dB Ch B 6 7 8 9 10 PIN 3+ PUSH IN A A PARALLEL BRIDGE MODEL 9001 MAXIMUM OUTPUT POWER PER CHANNEL 8Ω 1200 WATTS 4Ω 2200 WATTS PUSH IN B STEREO B -OUT A + -BRIDGE + SIGNAL GROUND LIFT DO NOT OPERATE WITHOUT THIS PROTECTIVE COVER + OUT B -- CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN AVIS : RISQUE DE CHOC ÉLECTRIQUE—NE
Model 10001 Features 1 2 3 1 2 10001 Professional Power Amplifier Clip/Limit Clip/Limit Signal Signal Temp/DC Temp/DC Active Active -6 -6 -10 -10 -3 -3 -15 -15 -1 -30 -80 -80 0dB Ch B Ch A 5 5 4 -1 -30 0dB 6 8 7 4 9 PUSH IN A PIN 3+ - OUT B OUT A + - + CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN AVIS : RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
Model 10004 Features 2 1 3 1 2 10004 Professional Power Amplifier Clip/Limit Clip/Limit Signal Signal Temp/DC Temp/DC Active Active -6 -10 -10 -3 -15 -10 -3 -1 -80 -80 Ch A 5 4 -1 -30 0dB -10 -3 -1 -30 -80 0dB -3 -15 -15 -15 -30 -6 -6 -6 -80 0dB Ch D Ch C Ch B -1 -30 0dB 5 6 7 8 7 6 4 9 CAUTION IN C PUSH IN PUSH Designed & manufactured in the USA by: A RISK OF ELECTRIC SHOCK DO NOT OPEN AVIS : RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR WARNING TO R
Connecting Inputs Input connections are made via the 3-pin XLR connectors (pin 3+) on the rear panel of the amplifier. The inputs are actively balanced. Pinout and polarity of connection cables should be configured as shown at the right. The input overload point is high enough to accept the maximum output level of virtually any signal source. All models have two input connections; the exception being Model 10004, which has four.
Connecting Power Professional Series power amplifier power requirements are rated at: a) “idle” b) 1/8th power (“typical” music conditions) c) 1/3rd power (“continuous” music conditions) d.) maximum rated power. Never try to hold the power switch in the “ON” position if it won’t stay there itself! Always turn off the amplifier before changing operating modes! The maximum power current draw rating is limited only by the front panel circuit breaker.
Bridging Precautions Use extreme caution when operating the amplifier in the bridged mode; as potentially lethal voltage may be present at the output terminals. Never ground either side of the speaker cable when the amplifier is in the bridged mode; both sides are hot. If an output patch panel is used, all connections must be isolated from each other and from the panel. The recommended minimum nominal load impedance in the bridged mode is 4Ω (equivalent to driving both channels at 2Ω).
Indicators Professional Series amplifiers feature four front panel LED indicators per channel: Clip/Limit, Signal, Temp/DC, and Active. These LED indicators inform the user of each channel’s operating status and warn of possible abnormal conditions. Clip/Limit LED A channel’s Clip/Limit LED will light dimly at the onset of clipping and increase in brilliance as clipping becomes more severe, staying on until the clipping ceases.
Thermal Protection The internal fan(s) will keep the amplifier operating well within its intended temperature range under all normal conditions. If a channel’s heat sink temperature reaches 75°C, (85°C for Models 7001 and 8001) which may indicate an obstructed air supply, clogged air filter, etc., that channel will independently protect itself by disconnecting its load and shutting down until it has cooled to 72°C ( 82°C for Models 7001 and 8001). During this time, the channel’s DC/Temp LED will light.
All loudspeakers have electrical, thermal, and physical limits which 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 Audio Professional Series amplifiers automatically protect speakers from DC voltages and subsonic signals. For more information, see the section on Protection Features.
Appendix A - Professional Series Block Diagram The block diagram shown is accurate for all the Professional Series amplifiers. (The Model 10004 amplifier has four channels arranged in two pairs.
Appendix B - General Amplifier Specifications (Model 3301) 8Ω Stereo Power 4Ω Stereo Power 2ΩStereo Power 8Ω Bridged Mono Power 4Ω Bridged Mono Power Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.
Appendix B - General Amplifier Specifications (Model 4601) 8Ω Stereo Power 4Ω Stereo Power 8Ω Bridged Mono Power Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.
Appendix B - General Amplifier Specifications (Model 4801) 8Ω Stereo Power 4Ω Stereo Power 8Ω Bridged Mono Power 2ΩStereo Power 4Ω Bridged Mono Power Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.
Appendix B - General Amplifier Specifications (Model 6001) 8Ω Stereo Power 4Ω Stereo Power 2ΩStereo Power 8Ω Bridged Mono Power 4Ω Bridged Mono Power Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.
Appendix B - General Amplifier Specifications (Model 7001) 8Ω Stereo Power 4Ω Stereo Power 8Ω Bridged Mono Power 2ΩStereo Power 4Ω Bridged Mono Power Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.
Appendix B - General Amplifier Specifications (Model 7301) Lows @ 100Hz, <0.1% THD+N Both Channels @ 4Ω Lows @ 2Ω, Highs @ 4Ω Lows @ 4Ω, Highs @ 8Ω Lows @ 8Ω, Highs @ 16Ω Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.
Appendix B - General Amplifier Specifications (Model 8001) 8Ω Stereo Power 4Ω Stereo Power 8Ω Bridged Mono Power 2ΩStereo Power 4Ω Bridged Mono Power Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.
Appendix B - General Amplifier Specifications (Model 9001) 8Ω Stereo Power 4Ω Stereo Power 8Ω Bridged Mono Power 2ΩStereo Power 4Ω Bridged Mono Power Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.
Appendix B - General Amplifier Specifications (Model 10001) 2Ω Stereo Power 1Ω Stereo Power 4Ω Bridged Mono Power 2Ω Bridged Mono Power Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.
Appendix B - General Amplifier Specifications (Model 10004) 8Ω Stereo Power (x4 ch.) 4Ω Stereo Power (x4 ch.) 8Ω Bridged Mono Power (x2 ch.) 2ΩStereo Power (x4 ch.) 4Ω Bridged Mono Power (x2 ch.) Max RMS Output Voltage (each channel) Peak Output Voltage (each channel) Frequency Response (+0 / -0.
Appendix C - Wire Gauge Charts Stranded Cable Lgth. (ft.) Wire Gauge (AWG) Power Loss (8 ohm load) Power Loss (4 ohm load) Power Loss (2 ohm load) 5 18 16 14 12 10 0.81% 0.51 0.32 0.20 0.128 1.61% 1.02 0.64 0.40 0.25 3.2% 2.0 1.28 0.80 0.51 10 18 16 14 12 10 1.61% 1.02 0.64 0.40 0.25 3.2% 2.0 1.28 0.80 0.51 6.2% 4.0 2.5 1.60 1.01 40 18 16 14 12 10 8 6.2% 4.0 2.5 1.60 1.01 0.60 11.9% 7.7 5.0 3.2 2.0 1.20 22% 14.6 9.6 6.2 4.0 2.4 18 16 14 12 10 8 11.9% 7.7 5.0 3.2 2.0 1.20 22% 14.6 9.
Appendix D Meyer-Compatible Power Amplifiers The Crest Audio Models MA5850, MA9130, and MA7120 Professional power amplifiers are specifically designed in close cooperation with Meyer Sound Laboratories to meet the needs of the European Meyer Sound loudspeaker user. This manual describes all of the important aspects of amplifier installation, mounting, connection and operation. Additional information pertaining to these power amplifiers is provided in this appendix.
MA7120 8Ω Bridged Mono Power 4Ω Bridged Mono Power Max RMS Output Voltage (bridged) Peak Output Voltage (bridged) Frequency Response (+0 / -0.
Crest Audio Inc. 100 Eisenhower Dr., Paramus NJ 07652 USA TEL: 201.909.8700 FAX: 201.909.8744 http://www.crestaudio.com Printed in USA Power is serious business. v. 1.6 12/15/97 © 1997 Crest Audio, Inc.
