Appendix D
The Crest Audio Models MA5850, MA9130, and MA7120 Professional power amplifiers are specifically designed in close coopera- tion 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.
MA5850 - Based on the Crest Audio Professional Series 4801 power amplifier, the MA5850 contains custom circuitry to limit output to 58V RMS per channel, effectively preventing driver
MA9130 - The MA9130 is based on the Crest Audio Professional Series 8001 power amplifier, using a custom designed, low noise two speed fan and custom circuitry for operation as a Meyer Type 2 Power Amplifier. The MA9130 gain setting is also 23 dB.
MA7120 - The MA7120, based on the Crest Audio Professional Series 6001 and 7001 power amplifiers, is intended for bridged mode operation, with a voltage gain of 6.3 (+16 dB). It has been specifically designed to meet the high power requirements of a Meyer Type 3 power amplifier.
Warranty applicable in USA, Canada, U.K., and many other countries. Power figures are watts per channel, both channels driven. Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications. Crest Audio specification literature is available in downloadable PDF file format; visit our website at http://www/crestaudio.com. ©1996 Crest Audio Inc.
MA5850 | 1kHz, <0.05% THD+N | |
8Ω Stereo Power | 400W | 300W |
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4Ω Stereo Power | 575W | 480W |
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8Ω Bridged Mono Power | 1150W | 960W |
Max RMS Output Voltage (each channel) | 58V |
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Peak Output Voltage (each channel) | 82V |
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Frequency Response (+0 / | 20 |
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Power Bandwidth (rated power at 4Ω , 1% THD+N) | 20 |
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Protection Circuitry | Clip Limit, IGM, AutoRamp, High Temp, | |
| DC voltage, | |
THD+N (rated power at 8Ω , 1kHz) | <0.05% |
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SMPTE IMD (rated power at 8Ω , 60Hz & 7kHz) | <0.015% |
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Damping Factor | 400:1 |
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Input CMRR (1kHz) | >60 dB |
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Input Sensitivity (rated power at 4Ω ) | 3.5V RMS |
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Voltage Gain | X14 (+23dB) |
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Input Impedance (balanced) | >20kΩ |
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Hum and Noise (“A” weighted, full power, 4Ω ) |
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Crosstalk (“A” weighted, full power, 4Ω ) |
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Class | H |
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Input Connectors (per channel) | Female XLR (pin 3+), Octal Socket | |
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Output Connectors (per channel) |
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Filter Storage | 80,000 µF |
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Power Supply (factory configured) |
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Idle Current Draw (240V) | .55A |
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1/8 Power Curr. Draw (typical music, 120V/4Ω ) | 2.8A |
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1/3 Power Curr. Draw (continuous music, 120V/4Ω ) | 5.75A |
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Max Curr. Draw (circuit breaker rating, 120V/4Ω ) | 10.0A |
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Thermal Emissions (1/8 Power, 4Ω ) | 1803 BTU/hr |
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Thermal Emissions (1/3 Power, 4Ω ) | 3385 BTU/hr |
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Cooling | Rear to front tunnel heatsink, variable speed DC fan | |
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Controls | Front panel: 2 attenuators, circuit breaker/power switch; | |
| Rear panel: mode switch, signal ground lift jumper. | |
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LED Indicators (per channel) | Clip/Limit, Signal, Temp/DC, Active | |
Construction | 16 ga. single piece steel chassis, .187" (5mm) alum. front panel | |
Dimensions (Height x Width x Depth) | 3.5"x19"x15" (16" to rear ears) |
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| 89mm x 483mm x 381mm (406mm to rear ears) | |
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Gross Weight, Net Weight | 54.0 lbs (24.52 kg.), 49.0 lbs (22.25 kg.) | |
Warranty | 5 years, parts and labor† |
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†USA, Canada, U.K., and many other countries. Power figures are watts per channel, both channels driven. Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications. Crest Audio specification literature is available in down-
Appendix D | Crest Audio Pro Series Power Amplifiers |
