Fosi AudioTP-02 Subwoofer Amplifier Home Audio, Mini Bass Amp Mono Subwoofer Amp, with TDA7498E Chip 220W Volume and Frequency Control, for Powered Passive Subwoofers Bass Shakers

I am impressed. I just build a DIY subwoofer for my home theater. Had to build a specialty box because it had to fit between the back of my couch and the wall. Only had about 5-6" to work with. So, I had to build my own. Obviously I couldn't install an amplifier in such a shallow box, so I bought this thinking it was worth the try. I AM IMPRESSED. I did a great job on the subwoofer. While not very deep, it is large in length and height. I connected this amplifier externally, and I have to admit.... I am totally impressed. So clean and quiet (until music/movies are playing). Highly recommend it. If you have a subwoofer with a burned out amplifier, DON'T THROW IT AWAY. Just open it up, disconnect the speaker wires from the internal amplifier, extend the speaker wires outside of the cabinet, velcro this amp onto the existing subwoofer and connect the wires. Perfect repair. Now; if you are trying to replace a 400-1000 watt amplifier, well this is only 220 watts. But seriously..... unless you're in a car with a little weenie complex, do you really need more than 220 watts. Anyway; for the NORMAL person, this is a great amplifier for a DIY subwoofer build or to save you old subwoofer that has a broken amp.

I used this to replace a blown amp on an older Klipsch subwoofer. It works great and pushes it pretty hard. It pounds harder than I expected. Great amp!

This is a small but mighty subwoofer. Sound quality is excellent.

Seams to work fine.

I installed this on Polk PSW505 that had a bad amplifier and was quite surprised. So far, so good. Beyond plenty of power.

Powerful little guy! Works great!

One week in and this little amp does a good job driving my subwoofer. The original built-in amp in the subwoofer stopped working. I opened the cabinet, disconnected the existing electronics and added speaker wires to the driver speaker. Using the Fosi amp to directly drive the sub. Plenty of power, running the Fosi at about 12 o'clock on the volume control, my surround amp auto cal set the sub output at -5.0. I really didn't notice a difference in bass output between the old built-in amp and the Fosi. Great/easy way to save an expensive speaker.

My use case for this amplifier involves an in-wall mounted ten-inch non-powered subwoofer and a transceiver with RCA left and right passive subwoofer outputs. The location of the sound system is the great room/living room. Open floor plan, two story ceiling height with tile floors. While I have seen some reviewers claim this amplifier does not have the capability to power a large room, I did not find that to be the case at all. After connecting the Fosi amp to my transceiver, I was able to literally dial in the necessary frequency and volume I needed to compliment the other speakers in my sound system (all in-wall mounted surround speakers). The Fosi amp's frequency dial and volume dial allowed fine tuning of both until I had exactly what I wanted in the form of rich and ample bass that more than fills the space. Once I set it up and tuned it in, I have not had to worry with it again. This is a great product for those who have the need for a separate amplifier for your passive subwoofer. I highly recommend it.