Press and move to zoom.
Mouse over image to zoom.



SKU: ADM-20.4
Status: 1 In stock
Sold Per: Each


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.

HICC (High Instantaneous-Current Capability) For Greater Dynamics

When an amplifier outputs an audio signal, the connected speakers accumulate energy, reflex, and send energy back to the amplifier. The amplifier must then immediately cancel the speaker's reflex energy and instantaneously send out the next signal. The same high current required to achieve this is also necessary to handle speaker impedance fluctuations, which can force an amplifier to provide four to six times its usual current load. The DTA-70.1's instantaneous current capability ensures that audio output is not affected by power limitations. In order to handle high levels of instantaneous current, the DTA-70.1 incorporates several key design features.

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 microfarad 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.


Advanced Features

  • 75 Watts per Channel at 8 Ohms, 1 kHz, 0.08% THD, 2 Channels Driven, FTC
  • WRAT (Wide Range Amplifier Technology)
  • Three-Stage Inverted Darlington Circuitry to Reduce Distortion
  • All Discrete Output Stage Circuitry
  • Heavy Duty EI Transformer
  • Two Large 10,000 microfarad Capacitors for Effective Power Supply
  • Low-Impedance Copper Bus Bars for Perfect Ground Potential
  • High-Current, Low-Impedance Drive
  • Flat, High-Rigidity, 1/16" (1.6 mm) Anti-Resonant Chassis
  • Multi-Zone Audio Capability with Line-In and Line-Out

Other Features

  • 12 V Trigger Input and Output with Audio Switch
  • Banana Plug-Compatible, Color-Coded Speaker Posts
  • Input Level Adjustment on Rear Panel
  • Auto Standby On/Off Switch
  • Aluminum Front Panel with Power Light
  • Impedance Selector Switch (4-8 Ohms and 8-16 Ohms)
  • Optional Rack Mount Kit Available IRK-120-3A


# Channels 2
Rated Power Output 75 W / Channel 8 OHM
65 W / Channel 4 OHM
Continuous 6 OHM Rated Yes
Continuous 4 OHM Rated Yes
Amplifier Frequency Response (WRAT) 10 Hz-100 kHz/ +0, -3 dB
3-Stage Inverted Darlington Circuitry Yes
All Discrete Output Stage Circuitry Yes
Heavy Duty EI Transformer Yes
Large Capacitors for Effective Power Supply 10,000 uF Each (x2)
Low-Impedance, Copper Bus Plates for Perfect Ground Potential Yes
High-Current, Low-Impedance Drive Yes
Flat, High-Rigidity, Anti-Resonant Chassis 1.6mm Thick
Multi-Zone Audio Capability with Line-In and Line-Out Yes
Gold-Plated RCA Audio Input / Output Yes
Gold-Plated RCA Transparent Binding Post Yes
12V Trigger In / Out Yes
Input Level Adjustment Yes
Auto Standby On/Off Switch Yes
Aluminum Front Panel with Power Light Yes
Impedance Selector Switch 4 OHM and 8 OHM
Detachable AC Cord Yes
Rack Mount Kit Available IRK-120-3A
Power Output (1 kHz, 0.08%, 2 Channels Driven, FTC) 75 W / Channel 8 OHM
65 W / Channel 4 OHM
THD 0.08%
(Rated Power)
Damping Factor 60 (Front, 1 kHz, 8 OHM)
Input Sensitivity and Impedance 870 mV/20 k-OHM (Unbalanced)
Rated RCA Output Level and Impedance 0.87 V/270 OHM
(Line Out)
Frequency Response 10 Hz-100 kHz/+0 dB, -3 dB
Signal-to-Noise Ratio 110 dB (Line, IHF-A)
Speaker Impedance 4 OHM-16 OHM
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)
Weight 17.6 lbs. (8.0 kg)
File Download(s):Manual |Data Sheet