The HD-PA35A is a single input audio amplifier for systems demanding high energy efficiency. It may be used as a single zone amplifier fed from a variety of RDL or OEM mixers. It is ideal for providing one or more additional zones to a mix originating from another RDL HD series mixer amplifier. The 35 W power amplifier output is driven from a high-efficiency Class D amplifier stage. The amplifier output level may be VCA controlled using various optional RDL remote controls, or by industry standard 0 to 10 Vdc or 0 to 10 kOhm controls. The output provides a constant voltage (25 V, 70 V or 100 V). The HD-PA35A is engineered and manufactured in the U.S.A.The HD-PA35A provides a front-panel control to set the input gain. An optional remote control connected to the rear-panel detachable terminal block provides for remote adjustment of the output level. The tone controls adjust the equalization at the amplifier output.The amplifier includes an analog compressor/limiter for audio fidelity noticeably superior to conventional class D amplifiers with digital limiting. Increasing the input gain can substantially increase the average output power beyond that of a standard 35 W amplifier. A red front-panel LED flashes when the compressor is preventing output clipping. Normal audio level signals remain unaffected by the compressor thereby preserving audio dynamics. The audio is compressed according to three dynamic time constants providing aural transparency while maintaining clean, unclipped amplified audio for input overloads of up to 20 dB. The HD-PA35A, with compression, is capable of producing average audio output levels and clarity normally expected from amplifiers with a much higher output power rating.Main Features:One input with front-panel volume controlBass and Treble tone controlsDesigned as a single zone amplifierMaster volume VCA controlled with remote adjustment capabilityAmplifier output on detachable terminal blockUnbalanced summing inputs on RCA jacksIncludes power supplyHigh-efficiency Class D operationSpecifications:Rated Power: 35 W RMSAudio Input: Unbalanced stereo summing input on RCA jacksMaximum Input Level: + 9 dBV (+15.5 dBV, one input); (for 1% THD+N at output)Input level: -15 dBV (180 mV, to cross compressor threshold equaling 23 W amplified output, both input jacks driven)Noise: <-75 dB (max gain)THD+N: < 0.5% (1 kHz at compressor threshold)Compressor: Threshold 2 dB below rated output, automatically adjusting attack and release timesFrequency Response: Constant voltage: 3 dB (50 Hz to 18 kHz)Tone Controls: 10 dB @ 10 kHz, 9 dB @ 100 Hz (front-panel) with center detentPower Amplifier Output: 35 W RMS (25, 70 or 100 V); <1% THD+NIndicators (3): Front-panel: Signal present (green), Compressor activity (red), Power (bright=on, dim=standby, blue)VCA: Output level, 0 to 10 Vdc control, detachable terminal block (compatible with RDL VCA wall controls)Front-panel controls (4): Input, EQ (2, bass and treble), Power (latching pushbutton, on/standby)Ambient Operating Environment: 0 C to 50 C Maximum; 20 C RecommendedPower Supply (included): 100 to 240 Vac, 50-60 Hz, 50 W; 24 Vdc output to amplifier chassisDimensions and Weight: Height: 3.5 in.(8.89 cm); Width: 8.5 in.(21.6 cm); Depth: 6.75 in.(17.1 cm); Weight: 6 lb.(2.7 kg)Package Type: Cardboard BoxPackage Dimensions: 10.75 x 9.125 x 3.9375 in.Shipping Weight: 6.995 lbs.WEEE weight: 5.87 lbs.Tariff code: 8518.50.0000