Crest Audio PRO SERIES 9001, 9001 Specifications

POWER AMPLIFIER

9001

Product Description

The Crest Audio 9001 is a high-power amplifier designed to
meet the most stringent needs of professional use in concert tour­ing, high quality sound reinforcement, and professional fixed
installations.

The 9001 incorporates Crest Audio’s Power Density™engineer­ing design philosophy, providing users with more substantial
power and increased headroom for a given size than comparable
amplifiers.

A three rack-space amplifier, the 9001 uses forced-air to cool
channel heat sinks mounted in a back-to-back tunnel configura­tion. Stereo, parallel, and bridged mono operating modes can be
chosen with a rear-panel Mode Select switch. Actively balanced
female XLR input connections and single-screw solderless output
connectors are provided for each channel. The 9001 is fully com­patible with the other Crest Audio Professional Series amplifiers,
Octal Socket Accessories and the NexSys®computer-controlled
audio system.

Design and Construction

The 9001 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 9001 receives a rigorous “hot room”
burn-in before thorough final checkout on precision test equip­ment.

The no-compromise approach in the 9001’s electrical design and
mechanical construction provides the ultimate in reliability and
performance. Only high-grade components are used for the mod­ular sub-assemblies in this ultra-strong, 12 gauge steel single­piece chassis.

9001 Features

• Crest Audio’s legendary “overbuilt” power supply

• Toroidal power transformer

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

• Tunnel cooling with back-to-front air flow

• Variable speed DC fan

• High thermal mass heat sinks

• Balanced XLR inputs

• Single screw solderless output connectors

• Stereo/Parallel/Bridged Mono mode selector switch

• Rear panel ground lift jumper

• 9001 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.

• Recessed, stepped attenuators

• Front panel circuit breaker/power switch

• Modular construction

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

®

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

1kHz, 0.02% THD+N 1200W 2200W 3300W 4400W 6600W
20Hz-20kHz, 0.1% THD+N 1100W 2050W 3000W 4100W 6000W

Crest Professional

Series Amplifiers

are fully compatible

with the NexSys

Computer-Controlled

Audio system.

Figures are Watts per channel, both channels driven.

9001 POWER AMPLIFIER

SPECIFICATIONS

1kHz, <0.02% THD+N 20Hz-20kHz, <0.1% 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)

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

1200W 1100W
2200W 2050W
4400W 4100W
3300W 3000W
6600W 6000W
114V
161V
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.
<0.02%

0.05%
200:1
>60 dB

2.26V RMS
X40
>20kΩ
> -100 dB
> -60dB

Class

H
Female XLR Input (pin 3+), Octal Socket.
Single screw solderless copper output lugs.
46,000 µF
100V-240V, 50-60Hz

2.0A

16.2A

30.0A

65.0A
3850 BTU/hr
7700 BTU/hr

Cooling

Rear to front tunnel heatsink, variable speed DC fan, 140 CFM max.

Controls

Front panel: 2 attenuators, circuit breaker/power switch;
Rear panel: mode switch, signal ground lift jumper.
Clip/Limit, Signal, Temp/DC, Active
12 ga. steel chassis, 0.187" (5mm) aluminum front panel
5 1/4" x 19" x 19.5", 133mm x 483mm x 496mm
115 lbs (52.21 kg.), 110 lbs (49.94 kg.)
5 years, parts and labor†

Architect’s & Engineer’s Specifications

The power amplifier shall consist of 2 channels and deliver
a minimum of 1100 watts at 8 ohms, 2050 watts at 4 ohms
and 3000 watts at 2 ohms; per channel, both channels dri­ven, 20Hz-20kHz, <0.1% THD+N. In bridged (mono)
mode, it shall deliver a minimum of 4100 watts at 8 ohms,
and 6000 watts at 4 ohms, 20 Hz-20kHz, <0.1% THD+N.
The amplifier shall be rear-to-front tunnel-cooled, with a
variable-speed (140 CFM max) 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. 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 2.26V for rated power at 4 ohms. The
hum and noise level shall be greater than 100 dB below
rated output, “A” weighted. The amplifier shall have a
class H output stage with a modulated power supply. The
frequency response shall be greater than 20Hz-20kHz, +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 at 120V shall be no greater than 65A, both chan­nels driven continuously into 4 ohm resistance.
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 XLR type, one female
per channel. Output connectors shall be single screw sol­derless copper lug type, two per channel. 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 19" (483mm) wide, 5.5"
(133mm) high and 15" (381mm) deep. It shall weigh 110
lbs. (49.94kg) net. The amplifier shall be designated the
Crest Audio Model 9001.

PIN 3+

PUSH

IN A

IN B

PUSH

v. 2.4 10/15/97 B5000009

A

PARALLEL

BRIDGE

STEREO

B

*B5000009*

NEXSYS
OUTPUT
SAMPLE

SIGNAL

GROUND

LIFT

MODEL 9001

MAXIMUM OUTPUT

POWER PER CHANNEL

8Ω 1200 WATTS
4Ω 2200 WATTS

DO NOT OPERATE
WITHOUT THIS
PROTECTIVE COVER

OUT A

-­BRIDGE
+

OUT B

-­+

+

--

RISK OF ELECTRIC SHOCK

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

Designed & manufactured in the USA by:

Paramus, New Jersey 07652 USA

100 Eisenhower Dr., Paramus NJ 07652 USA

CAUTION

DO NOT OPEN

L'HUMIDITÉ

Crest Audio Inc.

100 Eisenhower Dr.

Crest Audio Inc.

TEL: [phone] FAX: [phone]

http://www.crestaudio.com

Printed in USA