SMP300 Class D Digital Subwoofer Amplifier Rated at 500W Max

Received this OSD SMP-100 subwoofer amp on January 9th 2020, after looking at different models this one made the most sense. After hooking it up and doing my tests this amp was exactly what I needed to include in my whole house audio system. This sub amp works excellent wired into my receiver and my 4 zone 8 speaker selector switch for my ceiling speakers with a separate not passive but an 8 inch active subwoofer, if it is wired and set up correctly this little amp @ 80RMS 100watts of power into 4 ohms can deliver enough power to shake my whole house at quarter of the volume from watching a movie or playing music it’s very clean sound with no hum feedback, it has a phase control to adjust for sub placement, a crossover control so you can adjust and set the low pass to your desire level and an overall volume control to set the desire volume, it will automatically switch off after 15 minutes if no audio signal is detected so no need for you to switch on and off manually. My recommendation is not to use speakers that are more than 8 inch 4 to 8 ohms as stated in the manual. Following a correct set up this little amp will deliver a clean solid deep bass without being out of phase with your system. This sub amp can also be used for powering an in-wall passive subwoofer like the OSD IWS 8 series which I will be doing later.

So good! Had to set the auto-off to 30 minutes. Frustrating when it turned off every 5 minutes…

Bought this to install in a Friends Bar / Lounge. This was my First time dealing with 70V System, I have to say its pretty Dang Good for Hanging Subwoofers Amp. Only wish it had more power for the price.

Didn't need a lot of power as I'm using with TV 5.1 sound system, as far as that goes works great. The amp detects when signal is coming in and LED goes from RED to GREEN and passive bass comes alive. I realized from photo and manufacturers website that speaker wire connection was thru a terminal block but it's really cheesy and loose as it's a plugin module(only part that doesn't feel quality at all), add to that how tight the 2 terminals are together and it's begging for a loose wire short. The screw down clamps do need seem to be able to hold the wire very tightly either. Why not use banana jacks like the 200W version as there seems to be plenty of room inside(I doubt the trigger input sees much use). May mod that at some point myself.

I tested this amp out separately from its target installation which is my home Flight Simulator. I used some Low Frequency Effect (LFE) sound mp3 example files with a Buttkicker LFE transducer. It appeared to work adequately. I did expect a bit more of a response from the Buttkicker LFE transducer though than I felt. So far, I had no complaints. It is when I installed it together with my Flight Simulator is when things went crazy. These amplifiers are designed to sleep and not enable their final power out amps until they receive a trigger or sense some audio input. As soon as I powered up the amplifier (initially it comes up in sleep mode) my Flight Simulator control electronics went crazy exhibiting very high level noise. Whether the amplifier was in sleep mode or its final amplifier stages energized and enabled, the inputs to my Fight Simulator software from my simulator hardware was exhibiting extreme noise and instability. One set of my simulator hardware actually failed completely upon powering up this amp. I was able to recalibrated thank God and it worked fine without this amplifier being powered up. Since I determined this amp would not be usable with my Flight Simulator electronics, I requested an Amazon return. I returned the amp and purchased the 'Dayton Audio SA1000 Subwoofer Amplifier' from Amazon. Hook this new amp up and everything worked satisfactory with absolutely no electronic noise coming from my Flight Simulator control electronics hardware. All my Flight Simulator control electronics remained quiet and stable. My conclusion is that either I had a defective amp, its design is poor, or being a class D amp, it naturally exhibits electronic noise. In any case I felt obligated to describe my experience with this amp in case any potential buyers might be planning to use it with their game consoles or systems.

I have this running a 6.5 sub and it is doing great. Its got plenty to power my speaker and sound quality seems good. Auto on/off works like its meant to. I don't really like the red light that stays on on standby but that's not a big deal. It is very small and locates easily but gets the job done as well as a big amp.

I'm running 2 passive 7in subs with this single amp and it perfect, my Receiver does not have a power output in the rear so auto shutoff was an important feature i was looking for. so far this little guy has worked splendidly.

Very pleased. Its works well with my SONOS Amp and it drives my outdoor subwoofer. Great bass in the pool courtyard.