Features

2-Channel Power Amplifier: The Integra ADM-20.4 is a two-channel stereo power amplifier rated at 75 watts per channels (into 8Ω, @ 1kHz, with 0.08% THD) or 65 watts per channels (into 4Ω, @ 1kHz, with 0.08% THD).

Wide Range Amp Technology (WRAT): Onkyo's Wide Range Amp Technology (WRAT) circuit layout prevents phase shifting by pushing the roll-off point higher than the listening-level frequency. Amplifying sound without phase shift creates an uncommonly well-focused and realistic audio image.

Three-Stage Inverted Darlington Circuitry: An important upgrade to the core WRAT concept is Integra's Three-Stage Inverted Darlington Circuitry, a low negative feedback topology featuring a discrete triple transistor array to cut distortion and boost current flow to the speakers. As well as improving efficiency, transient response, and audio clarity, discrete transistors run cooler, extending the life of your output stage for more years of trouble-free service.

All Analog Circuitry: A standard integrated amplifier has the dual task of both processing and amplifying audio signals, and is therefore susceptible to interference from digital circuitry. As a dedicated power amp with all-analog circuitry, the ADM-20.4 is protected against digital interference. From input to output, signal purity is maintained at every stage of the power amp. When partnered with a quality pre-processor (sold separately), this unit offers all the benefits of pure analog amplification - a warm, musical, and full-bodied sound.

High Output Power Supply: A massive EI transformer delivers a steady supply of power to the speakers, while two large 10,000 μF capacitors, heavy-duty transistors, and low-impedance copper bus bars work in concert to enhance the power and fidelity of your audio sources. A heavy-duty aluminum heat sink keeps the unit running cool for superior reliability and longer life.

Rigid Anti-Resonant Chassis: Housed in a rigid anti-resonant steel-plate chassis and finished with a tough one-piece aluminum front panel, the ADM-20.4 is highly resistant to vibration.

Line In and Out: The Integra ADM-20.4 is equipped with a stereo RCA line-level input to connect your pre-processor or pre-amplifier (sold separately). Its also equipped with a stereo RCA line-level output to daisy chain the audio signal to another power amplifier (sold separately).  The line-level input and output RCA jacks are gold-plated for excellent signal transfer.

• Input Level Adjustment: There is a rear-panel input level adjustment, so you can better match the output stage of your pre-processor or pre-amplifier with the input stage of the ADM-20.4.
• Audio Signal Turn-On: You can set the power amplifier to automatically turn on when it sense an audio signal from it line-level input. It will not turn off until there is no audio signal input for 3 hours (Auto Standby) or your press the "On/Standby" button on the front-panel.

Binding Post Speaker Terminals: The stereo power amplifier is outfitted with a set of  gold-plated binding post terminals for connection of one pair of speakers (4Ω to 16Ω compatible). The binding post terminals will accept bare wire (up to 10AWG), pin-connectors, and banana plugs (single or dual). There is a rear-panel speaker impedance selector to switch between 4Ω and 8Ω capability.

• 4Ω Setting: Use the 4Ω setting for loudspeakers that are 4Ω or greater, but less than 8Ω.
• 8Ω Setting: Use the 8Ω setting for loudspeakers that are 8Ω to 16Ω.

12V Trigger In/Out: The unit is equipped with a selectable 12-volt trigger input (3.5mm) and output (3.5mm) providing automatic power on/off with your home theater system.

Auto Standby: When the Auto Standby function is activated, the power amplifier will automatically enter Standby mode if there is no operation for 3 hours with no audio signal input.

Optional Rack Mount Kit: An optional rack mount kit (sold separately) provides a clean, finished look when installed in racks and cabinets.