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Integra ADM-20.4

Integra ADM-20.4

Best price now

$550.00at SweetwaterObserved at 10:51 PM

Compared across 3 stores. Prices are checked against each store and labelled with when.

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Our take on the Integra ADM-20.4

The Integra ADM-20.4 is a two-channel power amplifier rated at 75 watts per channel into 8 ohms, built to drive a second zone or a pair of bookshelf speakers from a receiver or preamp. It offers three turn-on modes (signal-sensing, voltage trigger, manual), a 10 Hz to 100 kHz frequency response and a 110 dB signal-to-noise ratio, with RCA, banana/spade and 3.5 mm trigger connections. The best new price is $550.00 at Sweetwater as of November 3, 2026, with two stores listing it new.

Best forPowering a second zone or pair of rooms from a multizone receiverBookshelf or in-ceiling speakers that need a modest separate ampOwners who want trigger-based automatic on/offStereo listeners adding an outboard amp to a preamp
Pros
  • 75 W per channel into 8 ohms is enough for most bookshelf and in-ceiling speakers
  • Three turn-on modes, including 12 V trigger, suit multizone setups
  • Very wide 10 Hz–100 kHz response and 110 dB SNR
  • RCA line out lets you daisy-chain another amp or zone
  • 3-year warranty and a solid 17.6 lb chassis
Cons
  • No HDMI and no surround processing, so it is stereo only
  • Damping factor of 60 is modest for low-impedance or hard-to-drive speakers
  • 870 mV input sensitivity is not ideal for low-output sources
  • No digital inputs, DAC or streaming built in
  • Only 2 x 75 W, so large floorstanders may want more power

Integra ADM-20.4 prices at every store

  • SweetwaterNew

    In stock

    $550.00Free shippingObserved at 10:51 PM
    Visit store
  • eBayPre-owned

    Availability unknownSold by thegridgoodwill (99.6% positive, 56,600 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $149.99+ $8.00 shippingVerified
    Visit store
  • ListenUpNew

    Out of stock

    $500.00Free shippingObserved at 10:51 PM
    Visit store

Also available at

  • eBayCheck price at eBay

Integra ADM-20.4 price history

Lowest price we've seen: $500.00 on Nov 4 at ListenUp. Tracked across 2 stores since Nov 4.

Specifications

three turn-on modes
signal-sensing, voltage trigger, and manual
frequency response
10-100,000 Hz (-3 dB)
signal-to-noise ratio
110 dB
total harmonic distortion
0.08%
weight
17.6 lbs.
warranty
3 years
Damping Factor
60 (Front, 1 kHz, 8 Ohms)Source
Input Sensitivity and Impedance
870 mV/20 k-Ohms (Unbalanced)Source
Total Wattage
150 Watt (2 x 75 Watt)
Number Of Channels
2
Connection Type
RCA, Banana/spade, Mini-phone 3.5 mm
Audio Outputs
RCA x 2, Banana/spade x 2 (speakers output)
HDMI Outputs
0
Multi-Zone Support
Yes
Number Of Outputs
2 (trigger)
Output Channel Quantity
2
Output Types
RCA, Banana/spade, Mini-phone 3.5 mm (trigger)
Speaker Outputs
2
Line Out
Yes
Depth
31.73 cm
Height
13.9 cm
Width
43.5 cm
Surround Sound
No

Questions and answers

Is the Integra ADM-20.4 worth it at $550?
At $550.00 at Sweetwater as of November 3, 2026, it is a fair price for a name-brand two-channel amp with a 3-year warranty and trigger control. Cheaper class D amps exist, but few offer the same multizone turn-on options.
How much power does it put out?
It is rated at 150 watts total, or 2 x 75 watts into 8 ohms. That suits bookshelf speakers and in-ceiling zones, not power-hungry floorstanders.
Can I use it for a second zone?
Yes. It supports multi-zone use and can turn on automatically via signal sensing or a 12 V trigger from a compatible receiver. Connect the zone pre-out to its RCA inputs.
What speakers can it drive?
Speakers rated 8 ohms are the safe match, given the 60 damping factor. Check that your speakers are not unusually low impedance before pairing.
What is in the box?
Expect the amplifier, a power cord and a printed manual. Speaker wire, RCA cables and a trigger cable are not included, so plan for those separately.
Does it have HDMI or a DAC?
No. It is an analog stereo amplifier with RCA and speaker connections only, plus a 3.5 mm trigger input. A separate DAC or receiver is needed for digital sources.
Where is the Integra ADM-20.4 cheapest?
At Sweetwater, for $550.00, as of our latest check.
Where can I buy the Integra ADM-20.4?
3 stores we checked sell it, including eBay, ListenUp, Sweetwater.

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