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    SKU: SMP-500DSP

    OSD SMP500800W Mono Class D Subwoofer Amplifier, Auto Sensing, 4 -8 Ohm ETL, CE Certified DSP App Control

    Purchase SMP500 DSP Mono-Channel Class D Subwoofer Amplifier 800W, Auto Sensing, 4 -8 Ohm ETL, CE Certified
    • Outdoor Speaker Depot SKU: SMP-500DSP smp500
    • In Stock


      Compare at: $748.99
      You Save: $249.99

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    OSD Audio's SMP500DSP Class D subwoofer amplifier is designed for use with higher wattage passive subwoofers such as in-wall subs that require external power. It is rack mountable and 1U chassis. This sturdy sub amplifier is not for the faint of heart. It serves up 800 watts of power peak and 400W RMS @ 4 ohms, so to say that it is powerful is an understatement. This sub amp does more than just supply power. You'll notice an improvement in the overall sound quality of your entire home theater surround sound system.

    • Mono Class D Dedicated Subwoofer Amp
    • 800W Peak /400W RMS @ 4 ohm
    • Variable High Cut Filter 30Hz-150Hz, front panel knob . 
    • Additional Front Panel Control: Phase Switch and Volume Control
    • Choice of Signal Level Input or LEF (Low-Frequency Effects)
    • Turn On Choice: Music Sensing, Manual On or 12V Trigger
    • Adjustable Gain/Volume Control Limiter
    • Signal (low level) and Speaker Level (high level) inputs
    • 110/220V switchable ETL, CE
    You'll experience deep, rich and crisp bass while watching your favorite movies, especially action and adventure flicks. A big bang for the buck, features include a front-mounted power meter, back panel adjustable gain and volume control limiter to protect the woofers as well as low-level and high-level pass-through input/outputs to cover newer and old school sound systems. Combining the best qualities of both class A and B amp technologies, distortion is low while efficiency is high, and the SMP500DSP Mono Amp also includes a variable high cut filter that routes higher frequencies to main speakers. This allows subs to concentrate on the low-frequency sound effects for which they are designed and keeps low bass away from your surround speakers for much cleaner highs and midrange.

    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

    • Power Output: 400W (RMS @ 4ohms) 1000W (Peak @ 4ohms)
    • Transformer Type: Switch-Mode
    • Input Terminals: Speaker (High) Level, Signal (Low) Level RCA
    • Outputs: Subwoofer, Speaker Pass-through
    • Input Sensitivity: 190mV
    • Crossover: 20-150Hz
    • Phase: 0-315°
    • Air-cooled or Fan-cooled: Air
    • Control: Phase, Crossover, Subsonic, Slope and Level
    • Remote Control: Yes
    • 12 Volt Triggers (Trigger Mode): Yes
    • Auto-On Sensing: Yes
    • Rack Mountable: Yes - mounts included
    • Dimensions (L x D x H): 17.13"" x 9.45"" x 1.75""
    • Weight: 7.6 lbs
    • Rating: ETL, CE
    • Warranty: 2 Years
    22 Questions asked
    Have a Questions?

    What's on your mind?

    Ryan • 03/31/2020, 5:02:14 PM I have a In Wall Sub Living Room 500W, 6 ohms, and In Ceiling Sub Patio 300W, 8 ohms. Can I use one SMP500 amp or do I need two?
    Customer Service • 04/01/2020, 12:00:53 PM
    Hi Ryan: The SMP-500 would be perfect for the 6-ohm In-wall sub. It might be an issue adding the 8-ohm in-ceiling. There should be plenty of power to go around for both subs but the Impedance would drop below 4-ohms. What is the Brand and model number of the 6-ohm? You could try the single SMP-500 and see if that works. If the load is too much the amp will get hot to the touch and might shut down. I would recommend adding a SMP-300 for the second sub if the SMP-500 is not enough for the two subs. TL/4/1/2020
    John • 12/17/2019, 2:17:43 PM What does the remote do for the amp? I am assuming on/off, volume. Anything else? Thank you
    Customer Service • 12/17/2019, 2:17:43 PM
    HI John: You can see an image of the IR Remote Control in the Owner's manual; It works in conjunction with the Digital display on the front. It features the usual suspects: Power On/Power Off, Volume Up/ Volume Down, Menu-Enter, Scroll Right/Scroll Left, Mute, Exit, There a number of settings in the menu that you can configure High pass filter, Low pass Filter, Change the slope from 0 to 48dB plus adjust the Phase Mode. You can save up to three different settings in the store 1, store 2, or store 3 buttons. Then you have a recall button for each corresponding store button. So you would store the settings/memory on store 1 button and you would need to push recall 1 button to listen to the amp with those settings. The last three buttons are Flat (no equalization) and then Night Mode On/Night Mode off. Night Mode: Limits the dynamic range of the amplifier so the louder context of the source signal is reduced. This feature allows the user to select night mode. Choose either enable or disable. I will post infographics with more info on the remote including the hex codes in case you want to control it with a universal remote. TL/5047
    Patrick • 12/17/2019, 2:17:43 PM Can this unit be used in full range mode? Considering 2 of these and your preamp one.
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Patrick: The SMP500 is a dedicated Subwoofer Amplifier that can power two 8 ohm Subwoofers in Parallel like our GLS-8; 8.0" in-ground sub. The new XMP300 would make a nice combo along with the Pre-One. The XMP300 can also power a couple of Pair of 8-ohm speakers. I would connect the Pre-1 to the SMP500 and then to the XMP300. That would give you 400 watts for your Subs at 4 ohms and 225 watts for the XMP300 at 4 ohms as well. Let me know if can help with your system? TL/5260
    Thomas Turk • 12/17/2019, 2:17:43 PM Is there any/much difference for sub-woofers, crossed over below 150Hz using a stereo amp or using this mono amp.. with same signal from both channels?, How many Watts for each channel would that give me into 8 Ohms
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Thomas: It depends on what Sub or Subwoofers you are connecting to, and if they have a crossover built in so, you can feed a direct full range signal. But this dedicated subwoofer amplifier provides a whole lot more control on the crossovers frequency range and slope that are selec=table. There are also 3 DSP presets available controlled at the front panel or by remote control. You can easily connect two 8 ohm subs for a 4-ohm load rated at 400 watts. Note low pass is typically mono from an AVR. The speaker level output is a single two-conductor which should be 12 gauge or higher. There is no comparison, no need to look any further. The amp is both multi-voltage and CE rated for European distribution. We do have an online dealer located in Norway; That has been adding our amplifiers to their mix. Good luck TL/5292
    Kent Johnson • 12/17/2019, 2:17:43 PM Does this amp have a built in crossover?
    Customer Service • 12/17/2019, 2:17:43 PM
    Hi Kent: Yes, the SMP500 has a built-in Low Pass Crossover network with additional adjustments for Gain level, Phase and High Cut filter. It also has a remote control and DSP circuit that allows you to save up to three different EQ settings. Good choice TL/5351