Crest audio FXA901 SPECIFICATIONS
FXA901
POWER AMPLIFIER
FXA
Product Description
The Crest Audio FXA901 professional power amplifier is
designed to achieve unsurpassed sonic performance and longterm reliability—even when operating under extreme stress—in
touring or fixed installation applications.
Absolute sonic accuracy is the hallmark of every Crest amplifier.
Bass is solid and defined to the limits of audibility, with ample
current reserves delivered by an “over-engineered” power supply
and advanced Class AB output circuit design. Wide-bandwidth
output devices assure detailed, transparent high frequency
response. And, thanks to Crest’s exclusive IGM circuit, the
FXA901 will drive 2Ω loads
safely without compromise in per-
formance.
Construction and Quality Control
The FXA901 is built exclusively in Crest’s own USA manufacturing facility, with internal components selected for premium
quality and proven durability. Each modular subassembly is pretested, and the assembled FXA901 receives a rigorous “hot
room” burn-in before thorough final checkout on precision test
equipment.
Power Specifications:
Other FXA Series Power Amplifiers
4Ω Stereo FXA601 FXA1201 FXA2401 FXA3601 FXA4801
1kHz, .01% THD+N 250W 600W 900W 1200W 1800W
20Hz-20kHz, 0.1% THD+N 200W 500W 800W 1100W 1700W
FXA901 Features
• Crest’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
• Massive, extruded aluminum heat sinks
• Balanced XLR and 1/4-inch (TRS) inputs
• 5-Way Binding Post Outputs
• Stereo/parallel/bridged mono mode selector switch
• Ground lift switch
•
TourClass
- ACL (Active Clip Limiting) prevents speaker damage with
- IGM (Instantaneous Gain Modulation) monitors speaker
- AutoRamp gradually increases gain to attenuator setting
- TourClass also includes comprehensive thermal manage-
• Input sensitivity selection
• Recessed, stepped attenuators
• Front panel circuit breaker switch
• Modular construction
• Three-year warranty
®
protection circuits:
gentle gain reduction at clip threshold.
loads to detect conditions that may overstress output
devices, allowing safe operation into nominal 2Ω impedances.
level when amplifier is turned on.
ment, and short circuit, DC voltage, turn-on/off transient,
current inrush and sub/ultrasonic input protection.
0 dB
CLIP
-3
SIGNAL
-1
FXA
PROTECT
ACTIVE
Figures are watts per channel, both channels driven.
CLIP
SIGNAL
PROTECT
OFF
ACTIVE
Power Specifications 8Ω Stereo 4Ω Stereo 2Ω Stereo 8Ω Bridged 4Ω Bridged
1kHz, 0.01% THD+N 250W 435W 500W 830W 1100W
20Hz-20kHz, 0.1% THD+N 245W 400W 450W 800W 900W
-6
-3
-10
-15
-30
-80
Ch A
-1
0 dB
-6
-10
-15
-30
-80
Ch B
FXA901 POWER AMPLIFIER
SPECIFICATIONS
1kHz, 0.01% THD+N 20Hz-20kHz, 0.1% THD+N
8Ω Stereo Power
4Ω Stereo Power
2Ω Stereo 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)
TourClass®Protection
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 8Ω )
Voltage Gain
Input Impedance (balanced/unbalanced)
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 220V
1/8 Power Curr. Draw
(typical music, 220V/4Ω)
1/3 Power Curr. Draw (continuous music, 220V/4Ω)
Max Curr. Draw (circuit breaker rating, 220V/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
Dealer-Configurable Gain/Sensitivity Options Factory Standard X61 .775V
250W 245W
435W 400W
500W 450W
830W 800W
1000W 900W
58V
82V
20Hz-20kHz, -3dB@135kHz
20Hz-20kHz, -.9dB/+.5dB
ACL, IGM, AutoRamp, short circuit, DC voltage,
turn-on/off transient, current inrush, sub/ultrasonic input.
<0.01%
<0.01%
550:1
> - 60dB
0.775V standard (see table below)
X61 standard (see table below)
>20kΩ/>10kΩ
-105dB
> - 60 dB
Class
AB
Female XLR (pin 2+, dealer configurable for pin 3+), TRS (tip+)
5-way output binding posts
27,200 µF
100V-240V, 50-60Hz
0.7A
3.4A
5.0A
8.0A
2030 BTU/hr
2726 BTU/hr
Cooling
Back-to-front via 2 rear panel mounted variable-speed DC fans
(filters removable without tools)
Front Panel: 2 attenuators
Rear Panel: signal ground lift switch, mode select switch
Clip/Limit, Signal, Temp/DC, Active
Steel chassis, 16 gauge. Double thickness in rack ear areas.
3.5" x 19" x 17.85" / 89 x 483 x 454mm
46 lbs. / 20.88 kg., 41 lbs. / 18.61 kg.
3 years, parts & labor
Gain Sens
Option 1 X40 1.12V
Option 2 X20 2.24V
Architect’s & Engineer’s Specifications
The power amplifier shall have two channels. At 8 ohms, 20Hz
- 20kHz, 0.1% THD+N, it shall deliver a minimum of 245 watts
per channel. At 4 ohms, 20Hz - 20kHz, 0.1% THD+N, it shall
deliver a minimum of 400 watts per channel. In bridged mono
mode with an 8 ohm load, 20Hz - 20kHz, 0.1% THD+N, it
shall deliver a minimum of 800 watts.
Two rear panel mounted variable speed DC fans (filters
detachable without tools) shall provide back to front air flow
through the chassis.
The amplifier shall have circuitry to protect itself from output
short circuits, thermal overload or other adverse load conditions. The amplifier shall protect speaker loads from DC voltage on outputs. The amplifier shall have active clip limiting
and impedance sensing circuitry. Output relays shall protect
the speakers from amplifier failure.
Each channel shall have a standard (factory-set) input sensitivity of 0.775 Volts, and shall be fitted with an internal jumper
which allows the gain to be altered to X20 or X40. The hum
and noise level shall be 105 dB below rated output, “A”
weighted. SMPTE IMD shall be less than 0.01% at rated
power, 60Hz and 7kHz. The amplifier shall have a class AB
output stage. The frequency response shall be 20Hz-20kHz,
+0, -0.3dB (1W/8Ω).
The amplifier will operate at 100V-240V, 50-60 Hz AC (configured at factory). Maximum current draw shall not exceed 8
amperes at 220VAC (limited by front panel breaker for bench
tests).
Front panel indicators shall include Active, Protect, Signal,
and Clip LED’s for each channel. Front panel attenuators
shall be recessed and detented.
Rear panel input connectors shall be female TRS and XLR
type, internally dealer-configurable for pin 2 (factory setting)
or pin 3 positive. Output terminations shall be 5-way output
binding posts. A ground lift switch and a Stereo/
Parallel/Bridged Mono mode operation switch shall be provided.
A rear-panel IEC AC mains socket (with power cord) or single
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.
Optional rack mount handles will be available. Dimensions
shall be 19" (483mm) wide, 3.5" (89mm) high and 17.85"
(454mm) deep. The amplifier shall weigh 41 lbs. (18.61 kg.)
net, and shall be designated the Crest Audio model FXA901.
Rear View
v. 1.0 11/6/97
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
Power figures are watts per channel, both channels driven. Crest Audio reserves the right to make improvements in manufacturing or design which may affect specification.
+
+
+
A
A
B
B
A
AB
A
A
B
A
B
B
A
A
•
•
+
••
B
Designed & manufactured in the USA by:
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
2+
1
3-
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: 201.909.8700 FAX: 201.909.8744
http://www.crestaudio.com
Crest Audio Inc.
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