This sub will blow away your Z5500. TRUST ME. I have the Z5500 and the setup actually performs well for what it is. Considering its a plastic cube, mass market system, it's not bad, for what it is. It performs much better then most mass market stuff which is mostly crap. But, for not alot of money, you can upgrade that setup and get considerably better performance. I did it not too long ago with my PC setup. Good luck!