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Home / Product Category / SPEAKERS / In Wall Speakers / In Wall Subwoofers / SMP100 Mono-Channel Class D Subwoofer Amplifier 100W, Digital, Auto Sensing, 4 -8Ω ETL and CE Certified

SMP100 Mono-Channel Class D Subwoofer Amplifier 100W, Digital, Auto Sensing, 4 -8Ω ETL and CE Certified

Product code: SMP-100

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OSD Price: $99.99
Compare at: $139.99 You Save: $40.00 (29%)
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Features & Specifications


  • A compact 100-Watt Class D subwoofer amplifier for multiple source applications
  • Ideal for powering subwoofers used in whole-house audio or dedicated home theaters
  • Highly efficient Class D technology runs cool under demanding loads
  • Adjustable low-pass filter for distortion-free bass
  • Front panel phase and volume controls
  • Choice of speaker level or audio line level inputs (RCA)
  • Auto sensing feature automatically turns on or off when signal is detected
  • Distributed power capability for speakers and subs
  • Two-year warranty

  • Our SMP100 Class D Digital Subwoofer Amplifier is a compact 100W amp designed to power passive subwoofers used in home theaters or whole house audio systems. We call this our “tiny but mighty” powered sub because it measures less than six inches wide but supplies an in-wall or stand-alone subwoofer the power it needs so you can experience room-shaking low frequency impact (bass) on movie and music soundtracks. The advanced crossover circuit can be set at different frequency ranges (35Hz to 160Hz) and can be adjusted with the front-panel control knob. Other features include front-panel adjustable phase and volume controls to dial in just the right amount of low frequency effects (LFE).

    Includes Class D Amp Technology
    The SMP100 uses Class D digital amplifier technology that combines the best qualities of both Class A and B amp protocols into a highly efficient compact chassis that is ideal for budget-minded users who want a feature-rich digital sub amp that does not run hot or take up a lot of space.

    Auto On/Off Switch
    The SMP100 includes auto sensing that turns on the amp when an audio signal is detected then turns off automatically after 15 minutes when a signal is not detected so no more worrying about whether you hit the off switch before bedtime.

    Master Volume Control
    When properly setup, the volume control on the SMP100 will control both the amp and the receiver volume to which it is connected for simple operation.

    Includes Speaker Level and RCA Inputs
    With both RCA and speaker level connections, the SMP100 acts as a distributed amplifier and will also power a pair of in-ceiling speakers.

    Why Add A Subwoofer Amp?
    A powered subwoofer has its own internal amplifier, but a passive subwoofer will require a separate amplifier and in-wall subs are most commonly passive. The SMP100 Class D Digital Subwoofer Amp not only adds necessary power but also filters low frequencies away from other speakers, which in turn gives you much cleaner highs and midrange frequencies. Add this little subwoofer amp and you’ll improve the overall sound quality of your entire surround sound or whole house audio system.



      View Owner's Manual          


    3 Questions & 3 Answers
    from California asked:
    September 8, 2019

    Why use trigger at all when auto sensing already turns amp off with loss of signal?

    What is the power draw after auto sensing has turned amp off?

    1 Answer
    Hi Tom:

    Some people like a hardwire option like the 12V Trigger. But not all 12V triggers are created equal, so it may or may not work. But if and when it does it is instant on and off. Audio Sensing works on all applications, but you have to wait 15 minutes to turn off. Standby Power draw is 1.8W (listed in the specs in the owner's manual). Actual Energy-saving rating would be between .5 and 1 watt.


    Submitted by: Tim Leahy on September 19, 2019

    from SanDiego asked:
    April 4, 2019
    Hi, will this power a Niles gss10 passive subwoofer? m using this for an in-ground subwoofer for outdoors.
    1 Answer
    Hi Steven: Based upon the Niles Specs, the SMP100 should work fine. It is currently out of stock but is scheduled for the end of April delivery at the same time we get our new SMP200 and SMP300. We have a 30-day performance guarantee which would allow you to try the SMP100 and determine if it has enough juice. We will have a $199 and $299 option in addition to the SMP100. TL/5489
    Submitted by: Tim Leahy on April 5, 2019

    from Texas asked:
    September 30, 2018
    Hello, would this amp work to power a sub200?
    1 Answer
    Hi Edward: The XMP100 and the new OMSUB200S Outdoor Subwoofer are a good match. The 4-ohm woofer will demand higher output from the XMP100 versus an 8-ohm woofer. The XMP100 also features Auto turn on as well. It's worth trying with our 30-day evaluation. If it does not have enough output, then you will want to exchange for one of our larger subwoofer Power amps have bigger Subwoofer amplifiers TL/5224
    Submitted by: Tim Leahy on October 3, 2018

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