Power Specifications 8Ω Stereo 4Ω Stereo 2Ω Stereo 8Ω Bridged 4Ω Bridged
1kHz, 0.01% THD+N 600W 900W 1000W 1800W 2000W
20Hz-20kHz, 0.1% THD+N 550W 800W 900W 1600W 1800W
Figures are Watts per channel, both channels driven.
Product Description
The Crest Audio HD9 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 H circuitry. Wide-bandwidth output devices
assure detailed, transparent high frequency response. And, thanks
to Crest’s exclusive IGM circuit, the HD9 will drive 2Ω loads
safely without compromise in performance.
Construction and Quality Control
The HD9 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 HD9 receives a rigorous “hot room” burn-in
before thorough final checkout on precision test equipment.
HD9 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, allowing safe operation into nominal 2Ω imped-
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 magnetic circuit breaker switch
• Modular construction
• Three-year warranty (parts and labor)
4Ω Stereo HD2 HD4 HD6 HD12 HD18
1kHz, .01% THD+N 250W 435W 600W 1200W 1800W
20Hz-20kHz, 0.1% THD+N 200W 400W 500W 1100W 1700W
Power Specifications:
Other HD Series Power Amplifiers
HD9
POWER AMPLIFIER
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