- That receiver is NOT 1000w. I guarantee you that. It's probably closer to around 100w in total with all 5 speakers, maybe 150w with the subwoofer (if it has one).
- I wouldn't bother replacing speakers on that thing. I'd honestly opt for a better receiver first. Walmart believe it or not has a really great mid level Pioneer unit for $200 (just there earlier). Yamaha, Onkyo, and Denon entry level receivers are all around $200 or so as well, and they'll all be significantly better than that Sony unit you have.
- Don't buy Bose speakers. It's like buying Beats headphones. Just......don't. Buy some real speakers instead. But only after you upgrade that receiver.
Your speakers are all 3ohm. Have fun finding another receiver that can handle a 3ohm load, and have fun finding quality 3ohm speakers to use with that receiver. Sorry to put it so bluntly. You're stuck with what you have. You're welcome to replace the receiver and / or the speakers...but they will NOT work correctly together with ANY of the equipment that you have currently, unless you buy a very expensive receiver, or a 2ohm power amp (which why bother for those speakers?).
EDIT 2 (So you can kind of understand why I said the above edit):
Most home stereo speakers are going to be 8ohm (few are 6ohm, even less are below that). 4ohm has HALF the resistance of 8ohm, which means theoretically twice the power going through it. 3ohm is even less than that. Home receivers in general are only made to run 8ohm loads (most will do 6ohm fine, very few will handle 4ohm or less....that's car stereo territory). Basically it'd be like trying to power 2x R9 290x's with a Diablotek 500w PSU. It might work and power on, but you definitely won't get any proper use out of it, and something will eventually cook itself very very quickly.Edited by pioneerisloud - 11/2/13 at 1:25am