I bought this sub from the original owner without knowing much about it, but figured it should work well for my purposes, which was a modest 2-channel audio system that needed some punch added to the bottom-end.

I have been very pleased with this tiny little sub....it adds just the right amount of bass to most music sources and blends well with almost any speaker brand, or at least the ones I've tried it with. It has lots of connectivity features that make it a snap to set up and use. But what I like best about it is that it is almost invisible to the ears (that's a good thing) until there's actual bass content. You almost don't realize it's there until you switch it out of the circuit, then you want it right back in.

This sub could also work in modest A/V systems, but it's not going to be it's best in that type of application. For its size and price, it is definitely a solid performer that seldom disappoints in delivering fast, tuneful bass.