I have a predicament. I still really love my z-640's, but feel the need to splash out on the z-5500's. I've given up getting the Klipsch ProMedia 5.1's from the US and am not keen on the high end Creative stuff as i've seen them in action. Basically i won't be able to play music at a high level due to housemates, especially with Logitech's reknowned thuddy bass. So will playing the z-5500's at a low level make much difference to my z-640's when clarity is concerned. I just want a clearer, crisper sound, if at all possible.