Crest audio PRO 4801 SPECIFICATIONS

POWER AMPLIFIER

4801

Product Description

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.

Design and Construction

Crest Audio’s no-compromise approach in the 4801’s electrical design and mechanical construction adds up to the ultimate in reliability and performance. Only high-grade components are used for the modular sub-assemblies in their ultra-strong, single piece steel chassis

Crest Professional Series Amplifiers are fully compatible with the NexSys Computer-Controlled Audio system.

4801 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

• Five-year warranty (USA, Canada, U.K. & many other countries).

Power Specifications 8Ω Stereo 4Ω Stereo 2Ω Stereo 8Ω Bridged 4Ω Bridged

1kHz, <0.025% THD+N 400W 575W 700W 1150W 1300W

20Hz-20kHz, <0.05% THD+N† 300W 480W 600W 960W 1200W

Figures are Watts per channel, both channels driven. †Continuous sine wave power is limited by current rating of front panel circuit breaker and IGM circuit.

4801 POWER AMPLIFIER

SPECIFICATIONS

1kHz, <0.025% THD+N 20Hz-20kHz, <0.05% THD+N

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 / -0.3dB, 1W/8Ω)

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

Protection Circuitry

THD+N

(rated power at 4Ω, 1kHz)

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

Damping Factor (10-400Hz at 8Ω)

Input CMRR (1kHz)

Input Sensitivity (rated power at 4Ω)

Voltage Gain

Input Impedance

(balanced)

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

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

Input Connectors

(per channel)

Output Connectors (per channel)

Filter Storage

Power Supply

(factory configured)

Idle Current Draw (120V)

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

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

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

Thermal Emissions (1/8 Power, 4Ω) Thermal Emissions (1/3 Power, 4Ω)

Controls

LED Indicators

(per channel)

Construction

Dimensions

(Height x Width x Depth)

Gross Weight, Net Weight

Warranty

† 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. ©1997 Crest Audio Inc. 5/21/97

Rear View

400W 300W 575W 480W 1150W 960W 700W 600W 1300W 1200W 60V 85V 20 Hz-20 kHz, -3dB @ 53kHz 20 Hz-20 kHz, +0/-0.2dB Clip Limit, IGM, AutoRamp, High Temp, short-circuit, DC voltage, turn-on/off transient, sub/ultrasonic input. <0.025% <0.1% 400:1 >60 dB

1.1V RMS X40 >20kΩ > -100 dB > -60dB

Class

H Female XLR (pin 3+), Octal Socket 5-way output binding posts 80,000 µF 100V-240V, 50-60Hz

1.1A

5.6A

11.46

18.0A 1803 BTU/hr 3385 BTU/hr

Cooling

Rear to front tunnel heatsink, variable speed DC fan Front panel: 2 attenuators, circuit breaker/power switch; Rear panel: mode switch, signal ground lift jumper. Clip/Limit, Signal, Temp/DC, Active 16 ga. single piece steel chassis, .187" (5mm) alum. front panel

3.5"x19"x15" (16" to rear ears) 89mm x 483mm x 381mm (406mm to rear ears)

54.0 lbs (24.52 kg.), 49.0 lbs (22.25 kg.) 5 years, parts and labor†

Architect’s & Engineer’s Specifications

The power amplifier shall have two channels. Each channel shall deliver a minimum of 300 watts at 8 ohms, 480 watts at 4 ohms and 600 watts at 2 ohms, 20Hz-20kHz, <0.05% THD+N. In bridged mono mode, it shall deliver 960 watts at 8 ohms and 1200 watts into 4 ohms, 20Hz20kHz, <0.05% THD+N. The amplifier shall be rear-to-front tunnel-cooled, with a variable-speed DC fan. The amplifier shall have circuitry to protect itself and the speaker load from output short circuits, DC voltage on outputs, and thermal overload. The amplifier shall include circuitry to gradually increase gain to attenuator setting levels when the amplifier is turned on, and circuitry for impedance sensing and clip limiting. The amplifier shall have a voltage gain of X40 with an input sensitivity of 1.1V for rated power at 4 ohms. The hum and noise level shall be greater than 100 dB below rated output, “A” weighted. SMPTE IMD shall be less than 0.1 % at rated power, 60Hz and 7kHz. The amplifier shall have a class H output stage with a modulated power supply. The frequency response shall be greater than 20Hz-20kHz, +0/-0.3dB (1W/8Ω). The amplifier shall operate at 100-240V, 50-60 Hz AC (configured at factory). Maximum current draw shall not exceed 18 amperes at 120VAC, (circuit breaker limited), with both channels driving continuously into a 4 ohm resistor. The amplifier front panel shall include Active, Temp/DC, Signal Present and Clip/Limit LED indicators for each channel, a combination power switch/magnetic circuit breaker and recessed and detented gain pots. Input connectors shall be actively balanced and have female XLR-type, 3-pin connectors (pin 3+). Output connectors shall be 5-way output binding posts. Octal sockets for optional accessory modules and a signal/ground lift jumper shall be provided. A rear-panel AC mains cord having an appropriate AC plug for the intended operating voltage shall be provided (market dependent). The packaging of the amplifier shall allow for standard rack mounting without requiring space between similar units. Dimensions shall be 3.5" (89mm) high x 19" (483mm) wide x 15" (381mm) deep. The amplifier shall have a net weight of 49 lbs. (22.25kg) net. The amplifier shall be designated the Crest Audio Model 4801.

v. 2.2 3/25/97 B5000004

STEREO

PARALLEL

BRIDGE

IN A

PUSH

IN B

PUSH

PIN 3+

*B5000004*

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.

ATTENTION! POUR ÉVITER LE RISQUE D'INCENDIE OU DE CHOC

ÉLECTRIQUE, NE PLACEZ PAS CET APPAREIL SOUS LA PLUIE OU Á

MODEL #

L'HUMIDITÉ

USA ONLY

MAXIMUM

@ 120V, 60Hz

OUTPUT POWER

IN WATTS PER CHANNEL, 2Ω

INPUT CURRENT

4801 18 AMPS 6001 21 AMPS 720W

OUTPUT - CLASS 2 WIRING MAY BE USED

600W

OUT A

BRIDGE

SIGNAL

GROUND

LIFT

Designed & manufactured in the USA by:

Paramus, New Jersey 07652 USA

Crest Audio Inc.

100 Eisenhower Dr.

OUT B

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