Crest Audio Stereo Amplifier owner manual MA5850, Appendix D Meyer-Compatible Power Amplifiers

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Appendix D

Meyer-Compatible Power Amplifiers

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 over-excursion on the models for which it is intended. As the power supply of the MA5850 is capable of much greater output, this design also reduces possible damage from clipped waveforms. The MA5850 is specifically designed as a Meyer Type 1 power amplifier. The gain setting is 23 dB at Meyer’s recommendation.

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

20Hz-20kHz, <0.1% THD+N

8Ω Stereo Power

400W

300W

 

 

 

4Ω Stereo Power

575W

480W

 

 

 

8Ω Bridged Mono Power

1150W

960W

Max RMS Output Voltage (each channel)

58V

 

Peak Output Voltage (each channel)

82V

 

 

 

 

Frequency Response (+0 / -0.3dB, 1W/8Ω )

20 Hz-20 kHz, -3dB @ 53kHz

 

Power Bandwidth (rated power at 4Ω , 1% THD+N)

20 Hz-20 kHz, +0/-0.2dB

 

 

 

Protection Circuitry

Clip Limit, IGM, AutoRamp, High Temp, short-circuit,

 

DC voltage, turn-on/off transient, sub/ultrasonic input.

THD+N (rated power at 8Ω , 1kHz)

<0.05%

 

 

 

 

SMPTE IMD (rated power at 8Ω , 60Hz & 7kHz)

<0.015%

 

 

 

 

Damping Factor (10-400Hz at 8Ω )

400:1

 

Input CMRR (1kHz)

>60 dB

 

Input Sensitivity (rated power at 4Ω )

3.5V RMS

 

Voltage Gain

X14 (+23dB)

 

 

 

 

Input Impedance (balanced)

>20kΩ

 

Hum and Noise (“A” weighted, full power, 4Ω )

>-100 dB

 

Crosstalk (“A” weighted, full power, 4Ω )

>-60dB

 

Class

H

 

Input Connectors (per channel)

Female XLR (pin 3+), Octal Socket

 

 

 

Output Connectors (per channel)

5-way output binding posts

 

 

 

 

Filter Storage

80,000 µF

 

 

 

 

Power Supply (factory configured)

100V–240V, 50–60Hz

 

 

 

 

Idle Current Draw (240V)

.55A

 

1/8 Power Curr. Draw (typical music, 120V/4Ω )

2.8A

 

1/3 Power Curr. Draw (continuous music, 120V/4Ω )

5.75A

 

 

 

 

Max Curr. Draw (circuit breaker rating, 120V/4Ω )

10.0A

 

Thermal Emissions (1/8 Power, 4Ω )

1803 BTU/hr

 

Thermal Emissions (1/3 Power, 4Ω )

3385 BTU/hr

 

Cooling

Rear to front tunnel heatsink, variable speed DC fan

 

 

Controls

Front panel: 2 attenuators, circuit breaker/power switch;

 

Rear panel: mode switch, signal ground lift jumper.

 

 

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)

 

 

89mm x 483mm x 381mm (406mm to rear ears)

 

 

Gross Weight, Net Weight

54.0 lbs (24.52 kg.), 49.0 lbs (22.25 kg.)

Warranty

5 years, parts and labor†

 

†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

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Contents Including MA Series Amplifiers Important Precautions Table of Contents Introduction UnpackingMounting Crest Audio Model 10004 Power Amplifier Operating PrecautionsCrest Audio Model 7301 Power Amplifier Cooling RequirementsModels 3301, 4801, 6001 Features Model 4601 & 7001 FeaturesModel 7301 Features LowshighsModel 8001 Features 8001Model 9001 Features Model 10001 Features Professional Power AmplifierModel 10004 Features Ch a Ch B Ch C Ch DOctal Accessory Sockets Connecting InputsConnecting Outputs NexSysConnecting Power Operation ModesBridging Precautions Switches & ControlsIndicators Protection FeaturesSpeaker Protection Thermal ProtectionAmplifier Maintenance and User Responsibility Service / Warranty InformationChannel a Appendix B General Amplifier Specifications Model 1kHz, 0.012% THD+N 20Hz-20kHz, 0.05% THD+N 8Ω Stereo Power 1kHz, 0.025% THD+N 20Hz-20kHz, 0.05% THD+N 8Ω Stereo Power 430W 400W 1kHz, 0.02% THD+N 20Hz-20kHz, 0.05% THD+N 8Ω Stereo Power Both Channels @ 4Ω 750W 720W 1kHz, 0.02% THD+N 20Hz-20kHz, 0.1% THD+N 8Ω Stereo Power 1Ω Stereo Power 4Ω Stereo Power x4 ch Appendix C Wire Gauge Charts Appendix D Meyer-Compatible Power Amplifiers MA5850MA7120 Power is serious business

Stereo Amplifier specifications

The Crest Audio Stereo Amplifier has established a notable reputation in the audio industry, particularly among professionals seeking dependable and high-performance amplification solutions. Renowned for its robustness and exceptional sound quality, this amplifier is a popular choice for both live sound applications and studio settings.

One of the standout features of the Crest Audio Stereo Amplifier is its outstanding power output, which ensures that it can drive a wide range of loudspeakers with ease. Typically available in various power ratings, these amplifiers can provide significant wattage, allowing them to handle high-demand audio situations without distortion. This makes the Crest Audio amplifier an excellent choice for large venues, theaters, and event spaces.

The design of the Crest Audio Stereo Amplifier prioritizes efficiency and performance. Utilizing high-quality components, the amplifier is constructed with a rugged chassis and offers extensive heat dissipation to ensure longevity and reliability during prolonged use. This durability is particularly crucial in professional settings where equipment is often subjected to rigorous conditions.

In terms of technology, Crest Audio amplifiers incorporate advanced circuitry that enhances audio fidelity and minimizes noise. The use of Class AB amplification technology allows for a balanced performance that delivers both output power and audio clarity. This technology enables the amplifier to produce rich, warm tones, making it particularly effective for musical genres requiring dynamic range and precision, such as classical and jazz.

Another notable characteristic of the Crest Audio Stereo Amplifier is its comprehensive protection features. These amplifiers are designed with built-in thermal, short circuit, and overload protection, ensuring that the equipment can withstand potential hazards without compromising performance. The intuitive LED indicators provide visual feedback on the status of the amplifier, allowing users to monitor operation easily.

Connectivity is another essential factor, with Crest Audio amplifiers typically featuring a variety of input and output options. This flexibility enables integration with different audio systems, whether for simple stereo setups or complex multi-channel configurations. The professional-grade speakON and binding post outputs ensure secure connections to loudspeakers, promoting optimal performance.

Overall, the Crest Audio Stereo Amplifier is a reliable, high-performance solution for any audio professional. With its powerful output, sturdy construction, advanced technology, and user-friendly features, this amplifier continues to be a top choice for delivering exceptional sound quality in various applications. Whether in a studio environment or a live concert setting, the Crest Audio Stereo Amplifier stands out as a trusted tool for achieving audio excellence.
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