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ADM20.4 - 004


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Integra - ADM 20.4 - Power Amplifier

Integra - ADM 20.4 - Power Amplifier
Integra - ADM 20.4 - Power Amplifier Integra - ADM 20.4 - Power Amplifier - Back

Integra - ADM 20.4 - Power Amplifier 

Two-Channel Amplifier

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 Delivers Ultra-Clear Sound:

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 antiresonant 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 Microfarad capacitors, heavyduty 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.


  • 75 W/ch (1kHz, 8 ohms, 0.08% THD, 2ch Driven FTC)
  • WRAT (Wide Range Amplifier Technology)
  • High Current Low Impedance Drive 
  • 10,000 µF Capacitor x 2
  • Three Stage Inverted Darlington Circuitry
  • Copper Bus Plate for Low Impedance Drive
  • 1/16"(16mm) Full-flat Chassis 
  • Aluminum Front Panels
  • 12V Trigger in/out
  • Impedance Switch (4 ~ 8 ohms and 8 ~ 16 ohms)
  • Auto Power-on Function by Receiving Audio Signal
  • Auto Standby Function
  • Output (RCA, Through Out)
  • Compatible with IRK-120-3A


Amplifier Section:

Power Output

4 Ω (1 kHz, 0.08%, 2 Channels Driven, FTC)
        65 W/Ch

8 Ω (1 kHz, 0.08%, 2 Channels Driven, FTC)
        75 W/Ch

        (Rated Power)

Damping Factor
        60 (Front, 1 kHz, 8 Ω)

Input Sensitivity and Impedance
        870 mV/20 k-Ω (Unbalanced)

Rated RCA Output Level and Impedance
        0.87 V/270 Ω
        (Line Out)

Frequency Response
        10 Hz–100 kHz/+0 dB, -3 dB

Signal-to-Noise Ratio
        110 dB (Line, IHF-A)

Speaker Impedance
        4 Ω–16 Ω


Power Supply AC
        120 V~, 60 Hz

Power Consumption
        160 W

No-Sound Power Consumption
        45 W

Standby Power Consumption
        0.5 W

Dimensions (W x H x D)
        17 1/8" x 5 1/2" x 12 1/4"
        (435 x 139 x 317.3 mm)

        17.6 lbs. (8.0 kg)

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