Crest audio PRO 3301 SPECIFICATIONS

POWER AMPLIFIER

3301

Product Description

The Crest Audio Model 3301 power amplifier is a compact, medium-power amplifier designed to meet the demands of concert touring, studio monitoring, high-quality sound reinforcement, and professional installations.

Crest Audio developed this model in conjunction with the biggest names in touring sound. These amplifiers meet the specific demand for medium-power amplifiers with full-range capabilities, but optimized for mid- and high-frequency applications. The output section operates purely in Class AB, with no dynamic switching of supply rail voltages. The result is the cleanest, most transparent mid-and high-frequency audio power imaginable from amplifiers that never compromise quality.

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 3301 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

The 3301 is built exclusively in Crest Audio’s own USA manufacturing facility, with internal components selected for premium quality and proven durability. Each modular subassembly is pretested, and the assembled 3301 receives a rigorous “hot room” burn-in before thorough final checkout on precision test equipment.

Only high-grade components are used for the modular subassemblies in this ultra-strong, steel single piece chassis.

3301 Features

• Crest Audio’s legendary “overbuilt” power supply

• Toroidal power transformer

• Latest generation of high-speed, wide-bandwidth output devices

• Twin tunnel cooling with back-to-front air flow

• Dual, variable speed DC fans

• 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

• 3301 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.

- 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.

• Recessed, stepped attenuators

• Front panel circuit breaker/power switch

• Modular construction

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

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

Power Specifications 8 Ohms Stereo 4 Ohms Stereo 2 Ohms Stereo 8 Ohms Bridged 4 Ohms Bridged

1kHz, 0.025% THD+N 240W 380W 425W 725W 830W 20Hz-20kHz, 0.1% THD+N 220W 330W 400W 660W 800W

Figures are Watts per channel, both channels driven.

3301 POWER AMPLIFIER

SPECIFICATIONS

1kHz, <0.025% THD+N 20Hz-20kHz, <0.1% THD+N

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 / -0.3dB, 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

240W 220W 380W 330W 425W 400W 725W 660W 830W 800W 49V 69V 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

0.908V RMS X40 >20kΩ > -100 dB > -60dB

Class

AB Female XLR (pin 3+), Octal Socket 5-way output binding posts 29,200 µF 100V-240V, 50-60Hz

1.0A

6.25A

9.0A

11.0A 2235 BTU/hr 2821 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)

47.0 lbs (21.34 kg.), 42.0 lbs (19.07 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 220 watts at 8 ohms, 330 watts at 4 ohms and 400 watts at 2 ohms, 20Hz - 20kHz, <0.1% THD+N. In bridged mode, it shall deliver 660 watts at 8 ohms and 800 watts into 4 ohms, 20Hz - 20kHz, <0.1% THD+N. The amplifier shall be rear-to-front tunnel-cooled, with a variable-speed DC fan. It shall have circuitry to protect itself and the speaker load from output short circuits, DC voltage on outputs, and thermal overload. It shall have RMS clip limiting and impedance sensing circuitry. Output relays shall protect the speakers from any type of amplifier failure. The amplifier shall have a voltage gain of X40 with an input sensitivity of 0.908V for rated power at 4 ohms. The hum and noise level shall be at least 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 AB output stage with a modulated power supply. The frequency response shall be greater than 20Hz20kHz, + 0, -0.3dB (1W/8Ω).. The amplifier shall operate at either 100, 120, 220, or 240 volts, 50-60 Hz AC (configured at factory). Maximum current draw shall not exceed 11 amperes at 120VAC or 6 amperes at 240VAC (limited by front panel breaker for bench tests), 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. Rear panel 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 42.0 lbs. (19.07kg). The amplifier shall be designated the Crest Audio Model 3301.

Rear View

v. 2.4 4/9/97 B5000006

STEREO

PARALLEL

BRIDGE

PIN 3+ IN A

PUSH

IN B

PUSH

*B5000006*

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

L'HUMIDITÉ

USA ONLY

MAXIMUM

INPUT CURRENT

MODEL #

@ 120V, 60Hz

3301 11 AMPS

OUTPUT - CLASS 2 WIRING MAY BE USED

OUTPUT POWER

IN WATTS PER CHANNEL, 4Ω

330W

OUT A

BRIDGE

SIGNAL

GROUND

LIFT

Designed & manufactured in the USA by:

Paramus, New Jersey 07652 USA

OUT B

Crest Audio Inc.

100 Eisenhower Dr.

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