Crest 4801 Professional Power Amplifier
The Crest Audio Model 4801 is a compact, high-power amplifier designed to meet the most stringent demands of professional use in concert touring, studio monitoring, high-quality sound reinforcement, and professional installations. A forced-air configuration is used to cool channel heat sinks mounted in a back-to-back tunnel arrangement. An actively balanced female XLR input connection, Octal Socket, and 5-way output binding posts are provided for each channel. The 4801 is fully compatible in design with other Crest Audio Professional Series amplifiers, Octal Socket Accessories, and the NexSys® computer-controlled audio system.
Features:
- NexSys-ready
- Toroidal power transformer
- Tunnel cooling
- Variable speed DC fan
- High thermal mass heat sinks
- Balanced XLR inputs
- 5-way output binding post connectors
- Stereo/Parallel/Bridged Mono mode selector switch
- Rear panel ground lift jumper
- Extensive protection circuitry:
- Clip Limiting prevents speaker damage with gentle gain reduction at clip threshold.
- IGM (Instantaneous Gain Modulation) monitors connected loads to detect conditions that may overstress output devices, allowing safe operation into nominal 2Ω impedances.
- AutoRamp gradually increases gain to attenuator setting level when amplifier is turned on.
- Other protection circuitry: comprehensive thermal management, and short circuit, DC voltage, turn-on/off transient, current inrush and sub/ultrasonic input protection.
- Ultra-strong, single piece steel chassis
- Octal Accessory sockets
- Recessed, stepped attenuators
- Front panel circuit breaker/power switch
- Modular construction
Specifications:
- 1kHz, ɘ.025% THD+N & 20Hz-20kHz, ɘ.05% THD+N
- 8Ω Stereo Power: 400W, 300W
- 4ΩStereo Power: 575W, 480W
- 8Ω Bridged Mono Power: 1150W, 960W
- 2Ω Stereo Power: 700W, 600W
- 4Ω Bridged Mono Power: 1300W, 1200W
- Max RMS Output Voltage (each channel): 60V
- Peak Output Voltage (each channel): 85V
- 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 4Ω, 1kHz): <0.025%
- SMPTE IMD (rated power at 8Ω, 60Hz & 7kHz): <0.1%
- Damping Factor (10-400Hz at 8Ω): 400:1
- Input CMRR (1kHz): >60 dB
- Input Sensitivity (rated power at 4Ω): 1.1V RMS
- Voltage Gain: X40
- 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 (120V): 1.1A
- 1/8 Power Curr. Draw (typical music, 120V/4Ω): 5.6A
- 1/3 Power Curr. Draw (continuous music, 120V/4Ω): 11.46
- Max Curr. Draw (circuit breaker rating, 120V/4Ω): 18.0A
- 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: 54.0 lbs (24.52 kg.) / Net Weight: 49.0 lbs (22.25 kg.)
- Clip Limiting prevents speaker damage with gentle gain reduction at clip threshold.
- IGM (Instantaneous Gain Modulation) monitors connected loads to detect conditions that may overstress output devices, allowing safe operation into nominal 2Ω impedances.
- AutoRamp gradually increases gain to attenuator setting level when amplifier is turned on.
- Other protection circuitry: comprehensive thermal management, and short circuit, DC voltage, turn-on/off transient, current inrush and sub/ultrasonic input protection.
- 1kHz, ɘ.025% THD+N & 20Hz-20kHz, ɘ.05% THD+N
- 8Ω Stereo Power: 400W, 300W
- 4ΩStereo Power: 575W, 480W
- 8Ω Bridged Mono Power: 1150W, 960W
- 2Ω Stereo Power: 700W, 600W
- 4Ω Bridged Mono Power: 1300W, 1200W
- Max RMS Output Voltage (each channel): 60V
- Peak Output Voltage (each channel): 85V
- 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 4Ω, 1kHz): <0.025%
- SMPTE IMD (rated power at 8Ω, 60Hz & 7kHz): <0.1%
- Damping Factor (10-400Hz at 8Ω): 400:1
- Input CMRR (1kHz): >60 dB
- Input Sensitivity (rated power at 4Ω): 1.1V RMS
- Voltage Gain: X40
- 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 (120V): 1.1A
- 1/8 Power Curr. Draw (typical music, 120V/4Ω): 5.6A
- 1/3 Power Curr. Draw (continuous music, 120V/4Ω): 11.46
- Max Curr. Draw (circuit breaker rating, 120V/4Ω): 18.0A
- 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: 54.0 lbs (24.52 kg.) / Net Weight: 49.0 lbs (22.25 kg.)
