OFF
CLIP
SIGNAL
PROTECT
ACTIVE
CLIP
SIGNAL
PROTECT
ACTIVE
-1
-3
-6
-10
-15
-30
Ch A
0 dB
-80
-1
-3
-6
-10
-15
-30
Ch B
0 dB
-80
FXA
P o w e r S p e c i f i c a t i o n s
8
Ω
S t e r e o
4
Ω
S t e r e o
2
Ω
S t e r e o
8
Ω
B r i d g e d
4
Ω
B r i d g e d
1kHz, 0.01% THD+N
1 0 0 0 W
1 8 0 0 W
2 5 0 0 W
3 6 0 0 W
5 0 0 0 W
20Hz-20kHz, 0.1% THD+N
9 5 0 W
1 7 0 0 W
2 4 0 0 W
3 4 0 0 W
4 8 0 0 W
Figures are watts per channel, both channels driven.
Preliminary Product Description
The Crest Audio FXA4801 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. The FXA4801 provides
high power output coupled with true clarity, and is well-suited
for high-powered subwoofers and passive full range systems.
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 FXA4801 will drive 2
Ω
loads safely without compromise in performance.
Construction and Quality Control
The FXA4801 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 once assembled, the FXA4801 receives a rigorous
“hot room” burn-in before thorough final pre-shipment checkout
on precision test equipment.
FXA4801 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
• 2 pair of 5-Way Binding Post Outputs
• External switches for stereo/parallel/bridged mono mode,
Pin 2/3 hot (+),
ground lift, and gain/input sensitivity
• 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 2
Ω
imped-
ances.
-
AutoRamp gradually increases gain to attenuator setting
level when amplifier is turned on.
-
TourClass protection also includes comprehensive thermal
management, short circuit, DC voltage, turn-on/off tran-
sient, current inrush and sub/ultrasonic input protection.
• Recessed, stepped attenuators
• Front panel circuit breaker switch
• Modular construction
• Three-year warranty
4
Ω
S t e r e o
FXA601 FXA901 FXA1201 FXA2401 FXA3601
1kHz, 0.01% THD+N
2 5 0 W
4 3 5 W
6 0 0 W
9 0 0 W
1 2 0 0 W
20Hz-20kHz, 0.1% THD+N
2 0 0 W
4 0 0 W
5 0 0 W
8 0 0 W
1 1 0 0 W
Power Specs: Other FXA Series Power Amplifiers
FXA4801
POWER AMPLIFIER
FXA
