I have an extra sub that is not currently being used. It is an AudioSource 8" 120 watt sub. It came in a package I bought. I needed some weatherproof speakers for an outside patio and deck, and the sub just came in the package. It sounds real boomy to me, and just not as good as my current HT sub. Would this be a good candidate for a DIY project? Could I use the existing box and 120 watt amp, and just change the driver to better the performance? Perhaps something from Parts Express? What would need to be changed besides the woofer? Any electronics? And what about polyfill? The sub has both line level and speaker level inputs, phase & volume buttons, and power on/off (no sleep mode though - always on). Any ideas would be appreciated. Thanks.