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    SKU: SMP-100

    OSD SMP100100W Subwoofer Amplifier Mono, Class D, Auto Sensing, 4-8 Ohm, ETL CE Certified

    Purchase SMP100 Mono-Channel Class D Subwoofer Amplifier 100W, Auto Sensing, 4-8 Ohm, ETL CE Certified
    • Outdoor Speaker Depot SKU: SMP-100 smp-100-class-d-subwoofer-amplifier
    • In Stock


      Compare at: $194.99
      You Save: $95

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    Lifetime Tech Support


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    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).

    • 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
    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.

    Warning: California's Proposition 65


    This product can expose you to chemicals, including vinyl chloride, which is known to the State of California to cause cancer. For more information, go to

    • Design Type: Class D
    • Power Output: 80W RMS @ 8-ohm w/ 160W Peak
    • Power Output: 100W RMS @ 4-ohm w/ 200W Peak
    • Frequency Response: 20Hz ~ 160Hz, +/-1dB
    • Impedance: 8 ohm to 4 ohm stable
    • Input Sensitivity: 200mV
    • Crossover: 40-160Hz
    • Phase: 0-180'
    • Signal to Noise Ratio: 95dB
    • Signal Sensing: Power On and Trigger Mode
    • Automatic source switching
    • Input and Output Terminals: RCA input, speaker level in/out, trigger, sub out
    • Rack Mountable: No
    • Dimensions (W x H x D): 5.6" x 1.8" x 4.75"
    • Weight: 1.75 Lbs.
    • Warranty: 2 years
    4 Questions asked
    Have a Questions?

    What's on your mind?

    Edward • 12/17/2019, 2:17:43 PM Hello, would this amp work to power a sub200?
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    Stephen • 12/17/2019, 2:17:43 PM Hi, will this power a Niles gss10 passive subwoofer? m using this for an in-ground subwoofer for outdoors.
    Customer Service • 12/17/2019, 2:17:43 PM
    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
    tom • 12/17/2019, 2:17:43 PM 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?
    Customer Service • 12/17/2019, 2:17:43 PM
    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.TL/5670
    Mike Penicook • 12/01/2020, 1:22:25 PM Will this work with a Klipsch CA 800TSW using speaker level input connections?
    Customer Service • 12/04/2020, 1:23:00 AM
    Hi Mike: I think at a minimum you should step up to the SMP200 or even the SAM300 with its selectable Bass Boost from 25Hz to 50Hz with variable 0 to 12dB gain at the selected point. Its always better to have too much power for a passive sub than not enough. And the Klipsch are very efficient at 92dB. Good luck TimL/12/3/20