I can vouch for this subwoofer. Yes, please do the polyfill mod if you purchase it. It will greatly tighten up the bass. If you really want to make this a "killer sub" - add a new 15" driver. I put in a 15" Dayton DVC driver, and all I can say is WOW!!
Now, when I'm out at the audio stores, I'm never envious about the subs that they are offering: Mirage, Klipsch, B&W, etc. My sub now hangs with the best of them. I'm confident that the only sub to to out-do mine after modified, would be one of the SVS subs. My total cost: $255.00 (sub, shipping + a great price on a driver.)
