Crest Audio PRO SERIES 8001 User manual

Power Specifications 8ΩStereo 4ΩStereo 2ΩStereo 8ΩBridged 4ΩBridged
1kHz, <0.025% THD+N 750W 1225W 1400W 2450W 2800W†
20Hz-20kHz, <0.1% THD+N 720W 1200W 1400W 2250W 2800W†
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.
Product Description
The Crest Audio 8001 power amplifier is a compact, extremely
high-power amplifier designed to meet the most stringent needs
of professional use in concert touring, high quality sound rein-
forcement, and professional fixed installations.
A three rack-space amplifier, the 8001 uses forced-air to cool
channel heat sinks mounted in a back-to-back tunnel configura-
tion. Stereo, parallel, and bridged mono operating modes can be
chosen with a rear-panel Mode Select switch. Actively balanced
female XLR input connections and 5-way output binding post
connectors are provided for each channel.
The 8001 is fully compatible with the other Professional Series
amplifiers, Octal Socket Accessories and the NexSys®computer-
controlled audio system.
Design and Construction
The no-compromise approach in the 8001’s electrical design and
mechanical construction provides the ultimate in reliability and
performance. Only high-grade components are used for the mod-
ular sub-assemblies in this ultra-strong, single piece steel chassis.
8001 Features
• NexSys ready
• Toroidal power transformer
• Tunnel cooling
• 105 CFM AC fan, with twin speed option
• 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
• 8001 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 2Ωimped-
ances.
- AutoRamp gradually increases gain to attenuator setting
level when amplifier is turned on.
- Other protection circuitry: comprehensive thermal manage-
ment, 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).
®Crest Professional Series Amplifiers
are fully compatible with the NexSys
Computer-Controlled Audio system.
8001
POWER AMPLIFIER

v. 2.2 3/25/97 B5000001
Crest Audio Inc.
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: [phone] FAX: [phone]
http://www.crestaudio.com
Printed in USA
8001 POWER AMPLIFIER
SPECIFICATIONS Architect’s & Engineer’s Specifications
The power amplifier shall have two channels. Each chan-
nel shall deliver a minimum of 720 watts at 8 ohms, 1200
watts at 4 ohms and 1400 watts at 2 ohms; per channel,
both channels driven, 20Hz-20kHz, <0.1% THD+N. In
bridged mono mode, it shall deliver 2250 watts at 8 ohms,
and 2800 watts at 4 ohms, 20 Hz-20kHz, <0.1% THD+N.
The amplifier shall be rear-to-front tunnel-cooled, with a
105 CFM AC fan.
The amplifier shall have circuitry to protect itself and the
speaker load from output short circuits, DC voltage on out-
puts, and thermal overload. The amplifier shall include cir-
cuitry to gradually increase gain to attenuator setting lev-
els 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 1.75V 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%, rated power at 8Ω, 60Hz &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 37.5 amperes at 120VAC, (circuit breaker limited),
with both channels driving continuously into a 4 ohm resis-
tor.
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 5-way binding
posts, two pair per channel. Octal sockets for optional
accessary 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 19" (483mm) wide, 5.25"
(133mm) high and 15" (381mm) deep. It shall weigh 80
lbs. (36.0kg) net. The amplifier shall be designated the
Crest Audio Model 8001.
IN BIN A
PIN 3+
A
B
STEREO
BRIDGE
PARALLEL
SIGNAL
GROUND
LIFT
--
OUT A
+
--
OUT A
+
+
BRIDGE
--
+
BRIDGE
--
+
OUT B
--
+
OUT B
--
USA ONLY
MODEL #
8001 30 AMPS
MAXIMUM
INPUT CURRENT
@ 120V, 60Hz
OUTPUT POWER
IN WATTS PER
CHANNEL, 2Ω
1400W
OUTPUT - CLASS 1WIRING MAY BE USED
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
AVIS : RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR
Designed & manufactured in the USA by:
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
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 CETAPPAREILSOUS LA PLUIE OU Á
L'HUMIDITÉ
PUSHPUSH
Rear View
1kHz, <0.025% THD+N 20Hz-20kHz, <0.1% THD+N
750W 720W
1225W 1200W
2450W 2250W
1400W 1400W
2800W 2800W
91V
129V
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
1.75V RMS
X40
>20kΩ
> -100 dB
> -60dB
H
Female XLR (pin 3+), Octal Socket
2 pair 5-way output binding posts
70,000 µF
100V-240V, 50-60Hz
1.6A
10.8A
21.8A
37.5A
3380 BTU/hr
6140 BTU/hr
Rear to front tunnel heatsink, 105 CFM AC fan, 2-speed optional.
Front panel: 2 attenuators, circuit breaker/power switch;
Rear panel: mode switch, signal ground lift jumper.
Clip/Limit, Signal, Temp/DC, Active
14 ga. steel chassis, 0.25" (6mm) aluminum front panel
5.25"x19"x15" (16" to rear ears)
133mm x 483mm x 381mm (406mm to rear ears)
85 lbs. (38.6 kg.), 80 lbs. (36.0 kg.)
5 years, parts and labor†
8ΩStereo Power
4ΩStereo Power
8ΩBridged Mono Power
2ΩStereo Power
4ΩBridged 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)
Class
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)
Cooling
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 down-
loadable PDF file format; visit our website at http://www.crestaudio.com. ©1997 Crest Audio Inc. 5/21/97
*B5000001*