Ever wanted to build your own subwoofer? I know I personally have, if only because the pre-built ones really don't use very high quality components. A 10" woofer might be just what you need to beef up your setup, & the guys at HardwareAnalysis have layed it all down for you aspiring builders.

"A good subwoofer is a welcome addition to many stereo or home theatre setups. Unfortunately many subwoofers offer lots of boom, but very little bass. We detail exactly how to construct a subwoofer that'll put the vast majority of subwoofers to shame."