BIC America F12 12-Inch 475-Watt Front Firing Powered Subwoofer
Let's get one thing out of the way: this is the lowest quality unit on this list. It will distort noticeably if it is pushed, and gets muddy below 50hz. In fact it is just above the kind of quality one can expect from a "home a theater in a box" or standard 2.1 computer speaker system. But if you're ready to build your own system, this is a fine place to start, as long as you aren't expecting more than you're paying for. There is no adjustable crossover, digital EQ, or fancy wood finish. But the SW012 puts out plenty of bass for a smaller theater or decent sized bedroom, and will rattle wood floors when cranked up. it doesn't really produce much below 40hz, so it isn't capable of producing room lock without the help of another, more capable woofer, but what it does, it does fairly well. If you want your own genuine surround sound system, but aren't picky and just want a subwoofer, the SW012 will do fine.