Integra ADM-20.4 Two-Channel Amplifier (Black)

Model: ADM20.4 UPC: 751398010903 Item: 159620


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Product Information

Power a pair of speakers and expand your A/V receiver's audio distribution capabilities in the home theater and beyond with this powerful two-channel WRAT component, featuring auto power on and Three-Stage Inverted Darlington Circuitry.

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 Unaffected by Digital Noise

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. When partnered with a quality pre-processor, this unit offers all the benefits of pure analog amplification: a warm, musical, and full-bodied sound.

High Output Power Supply

From input to output, signal purity is maintained at every stage. 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. 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.

User-Friendly Features and Better Performance

The ADM-20.4 sports banana plug-compatible speaker posts to ensure a positive connection to the loudspeakers of your choice. The unit is also equipped with selectable audio or 12 V triggers providing automatic power on/off with your home theater system, plus a rearside level adjustment. A pair of line-in and line-out ports provide the multi-room capabilities to which this amplifier is perfectly suited.




  • Power output (1kHz, 0.08%, 2-channels driven, FTC)
    • 75W/channel 8Ω
    • 65W/channel 4Ω
  • THD: 0.08% (rated power)
  • Damping factor: 60 (Front, 1kHz, 8Ω)
  • Input sensitivity and impedance: 870mV/20k-Ω (Unbalanced)
  • Rated RCA output level and impedance: 0.87V/270Ω (Line Out)
  • Frequency response: 10Hz - 100kHz/+0dB, -3dB
  • Signal-to-noise ratio: 110dB (Line, IHF-A)
  • Speaker impedance: 4Ω - 16Ω


  • Power supply AC: 120V-,60Hz
  • Power consumption: 160W
  • No-sound power consumption: 45W
  • Standby power consumption: 0.5W
  • Dimensions (W x H x D): 17 1/8" x 5 1/2" x 12 1/4"
  • Weight: 17.6 lbs.

What's in the Box

What's in the Box:

  • ADM-20.4 Two-Channel Amplifier
  • Power cord


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Why did you choose this?
World Wide Stereo Store
good value quality product
George H. on Apr 15, 2020
good value quality product
George H. on Apr 15, 2020
Will this amp work with my Yamaha TSR 7850 Receiver to power my Klipsch tower speakers and sound better than using my receiver?
A shopper on Feb 22, 2020
  Thanks for your question. The Yamaha has a higher power rating driving 2 speakers: 95 watts RMS per channel at 8 ohms, .06% THD. The Integra is rated 75 watts per channel at 8 ohms, .08% THD. Given the efficiency of the Klipsch speakers it is unlikely that one would hear a big difference between the Yamaha and Integra.
What is difference between the Onkyo m!-5010 and Integra adm-20.4?
Jonsey on Dec 12, 2019
  Thanks for the inquiry.
Integra is the more prestigious product brand, incorporating additional features and in some applications, higher tolerance parts, which would be apparent if comparing home theater multi channel receivers.A direct comparison between the Integra ADM-20.4 and the Onkyo M-5010 however, yields very little difference between the two models.