User manual CREST AUDIO HD18 SPECIFICATIONS

[. . . ] 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 HD18 will drive 2 loads safely without compromise in performance. HD18 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. Construction and Quality Control The HD18 is built exclusively in Crest's own USA manufacturing facility, with internal components selected for premium quality and proven durability. [. . . ] In bridged mono mode with an 8 ohm load, 20Hz - 20kHz, 0. 1% THD+N, it shall deliver a minimum of 3400 watts. 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. 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 sensitivity of . 775 volt, and shall be fitted with an external switch which allows the gain to be altered to X20 or X40. The hum and noise level shall be 115 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 output stage. The frequency response shall be 20Hz-20kHz, +0, -0. 3dB (1W 8). The amplifier will operate at 100V-240V, 50-60 Hz AC (configured at factory). Maximum current draw shall not exceed 36 amperes at 120VAC (limited by front panel breaker). 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, rear-panel switchable for pin 2 (factory setting) or pin 3 positive. [. . . ] Crest Audio reserves the right to make improvements in manufacturing or design which may affect specification. Crest Audio specification literature is available in downloadable PDF format; visit our website at: http://www. crestaudio. com. ©1997 Crest Audio Inc. + + + A A AB A A B AB AB AB B B v. [. . . ]