Crest Audio FXA3601 User manual

OFF
CLIP
SIGNAL
PROTECT
ACTIVE
CLIP
SIGNAL
PROTECT
ACTIVE
FXA
-1
-3
-6
-10
-15
-30
Ch A 0 dB
-80
-1
-3
-6
-10
-15
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Ch B 0 dB
-80
Power Specifications 8ΩStereo 4ΩStereo 2ΩStereo 8ΩBridged 4ΩBridged
1kHz, 0.01% THD+N 700W 1200W 1400W 2400W 2800W
20Hz-20kHz, 0.1% THD+N 650W 1100W 1100W 2200W 2200W
Figures are watts per channel, both channels driven.
Product Description
The Crest Audio FXA3601 professional power amplifier is
designed to achieve unsurpassed sonic performance and long-
term 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 H circuitry. Wide-bandwidth output devices
assure detailed, transparent high frequency response. And, thanks
to Crest’s exclusive IGM circuit, the FXA3601 will drive 2Ω
loads safely without compromise in performance.
Construction and Quality Control
The FXA3601 is built exclusively in Crest’s own USA manufac-
turing facility, with internal components selected for premium
quality and proven durability. Each modular subassembly is pre-
tested, and the assembled FXA3601 receives a rigorous “hot
room” burn-in before thorough final checkout on precision test
equipment.
FXA3601 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®protection circuits:
- ACL (Active Clip Limiting) prevents speaker damage with
gentle gain reduction at clip threshold.
- IGM (Instantaneous Gain Modulation) monitors speaker
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.
- TourClass also includes comprehensive thermal manage-
ment, and short circuit, DC voltage, turn-on/off transient,
current inrush and sub/ultrasonic input protection.
• Input sensitivity selection
• Recessed, stepped attenuators
• Front panel circuit breaker switch
• Modular construction
• Three-year warranty
4ΩStereo FXA601 FXA901 FXA1201 FXA2401 FXA4801
1kHz, .01% THD+N 250W 435W 600W 900W 1800W
20Hz-20kHz, 0.1% THD+N 200W 400W 500W 800W 1700W
Power Specifications:
Other FXA Series Power Amplifiers
FXA3601
POWER AMPLIFIER
FXA

A
B
A
A
B
B
A
AB
AB
A
A
B
B
A
Designed & manufactured in the USA by:
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
WARNINGTO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT
EXPOSE THIS EQUIPMENTTO RAIN OR MOISTURE.
ATTENTION! POUR ÉVITER LE RISQUE D'INCENDIE OU DE CHOC
ÉLECTRIQUE, NE PLACEZ PASCET APPAREIL SOUS LA PLUIE OU Á
L'HUMIDITÉ
RISK OF ELECTRIC SHOCK
DO NOT OPEN
AVIS : RISQUE DE CHOC ÉLECTRIQUE—NE PASOUVRIR
CAUTION
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3
-2+
+
+
+
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••
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B
v. 1.0 11/6/97
Crest Audio Inc.
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: [phone] FAX: [phone]
http://www.crestaudio.com
FXA3601 POWER AMPLIFIER
SPECIFICATIONS
Rear
View
1kHz, 0.01% THD+N 20Hz-20kHz, 0.1% THD+N
700W 650W
1200W 1100W
1400W 1100W
2400W 2200W
2800W 2200W
90V
126V
20Hz-20kHz, -3dB@135kHz
20Hz-20kHz, -.23dB/+.85dB
ACL, IGM, AutoRamp, short circuit, DC voltage,
turn-on/off transient, current inrush, sub/ultrasonic input.
<0.01%
<0.01%
800:1
> - 60dB
0.775V standard (see table below)
X97.5 standard (see table below)
>20kΩ/>10kΩ
-105dB
> - 60dB
H
Female XLR (pin 2+, dealer configurable for pin 3+), TRS (tip+)
5-way output binding posts
140,000 µF
100V-240V, 50-60Hz
1.4A
5.3A
11.5A
21.0A
4750 BTU/hr
6300 BTU/hr
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.
5.25" x 19" x 17.85" / 133 x 483 x 454mm
72 lbs. (32.68 kg.), 67 lbs. (30.42 kg.)
3 years, parts & labor
8ΩStereo Power
4ΩStereo Power
2ΩStereo Power
8ΩBridged Mono 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)
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)
Class
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)
Cooling
Controls
LED Indicators (per channel)
Construction
Dimensions (Height x Width x Depth)
Gross Weight, Net Weight
Warranty
Gain Sens
Dealer-Configurable Gain/Sensitivity Options Factory Standard X97.5 .775V
Option 1 X40 1.87V
Option 2 X20 3.74V
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 650 watts
per channel. At 4 ohms, 20Hz - 20kHz, 0.1% THD+N, it shall
deliver a minimum of 1100 watts per channel. In bridged mono
mode with an 8 ohm load, 20Hz - 20kHz, 0.1% THD+N, it
shall deliver a minimum of 2200 watts.
The amplifier shall have circuitry to protect itself from output
short circuits, thermal overload or other adverse load condi-
tions. The amplifier shall protect speaker loads from DC volt-
age on outputs. The amplifier shall have active clip limiting
and impedance sensing circuitry. Output relays shall protect
the speakers from amplifier failure.
Two rear panel mounted variable speed DC fans (filters
detachable without tools) shall provide back to front air flow
through the chassis.
Each channel shall have a standard (factory-set) input sensitiv-
ity 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 H out-
put stage. The frequency response shall be 20Hz-20kHz, +0,
-0.3dB (1W/8Ω).
The amplifier will operate at 100V-240V, 50-60 Hz AC (config-
ured at factory). Maximum current draw shall not exceed 21
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 provid-
ed.
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, 5.25" (133mm) high and 17.85"
(454mm) deep. The amplifier shall weigh 67 lbs. (30.42 kg.)
net, and shall be designated the Crest Audio model FXA3601 .
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.