If you like the Polk speakers, that is great, but personally, from what little I have heard from them, I did not like the Tsi treble. If I were you I would ditch the speakers and get some bookshelf speakers with a subwoofer. Some respectable bookshelf speaker brands are Ascend, KEF, Behringer Truth Monitors. For good subs, check out Hsu, Rythmik, and Outlaw.