Crest Audio HD2 Specifications

Product Description
The Crest Audio HD2 professional power amplifier is designed
to achieve unsurpassed sonic performance and long-term reliabil-
ity–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.
Construction and Quality Control
The HD2 is built exclusively in Crest's own USA manufacturing
facility, with internal components selected for premium quality
and proven durability. Each modular subassembly is pre-tested,
and the assembled HD2 receives a rigorous "hot room" burn-in
before thorough final checkout on precision test equipment.
Power Specifications:
Other HD Series Power Amplifiers
4 Ω S t e r e o
HD4
1kHz, .01% THD+N 4 3 5 W
20Hz-20kHz, 0.1% THD+N 4 0 0 W
P o w e r S p e c i f i c a t i o n s
1kHz, 0.01% THD+N
20Hz-20kHz, 0.1% THD+N
POWER AMPLIFIER
HD6 HD9 HD12 HD18
6 0 0 W 9 0 0 W 1 2 0 0 W 1 8 0 0 W
5 0 0 W 8 0 0 W 1 1 0 0 W 1 7 0 0 W
8 Ω S t e r e o
1 5 0 W
1 5 0 W
HD2
HD2 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 connected
loads to detect conditions that may overstress output
devices.
- 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 magnetic circuit breaker switch
• Modular construction
• Three-year warranty (parts and labor)
-6
Protect Clip
-10
-3
-15
Active Signal
-1
-30
C h A
-80
0dB
-6
Protect Clip
-10 -3
-15
Active Signal
-1
-30
C h B
-80
0dB
4 Ω S t e r e o
2 5 0 W
2 0 0 W
8 Ω B r i d g e d
5 0 0 W
4 5 0 W
Figures are Watts per channel, both channels driven.