i upgraded from the sony sawm40 to an svs 16-46 pci and the difference is pretty big. i think it would take 3 sony's to equal the output. besides the wall/floor shaking ability though, the svs is more accurate and much deeper than the sony. it made an easily noticable difference in movies and music. even if you dont listen to movies really loud it still sounds more powerful. the added deep bass really changes the feel. scenes like the cave troll attack in lord of the rings benefit greatly. i think adding something like an svs sub should really round out your system, right now your speakers are quite a bit better quality than your sub.
