thanks alot Gary...not being the best DIY guy, i'll probably just deal with what im using in the band now (the one speaker).

while your online, hopefully, theres one more issue I need to adress...im hooking up a microKORG and an Alesis QS6.1 to a small yamaha mixer into the Z5500 system. the sound is great, but at some points it gets fuzzy when its real loud with some effects. im trying to find out the best way to amplify my sound so it comes out the best quality... the volume on the Z5500 is all the way up but without going into the boost, and the keyboards are at about 50%, and the first gain knobs on the mixer almost all the way up , the second gain knobs 75% way up and the master volume on the mixer about 50%...where should I be turning up the volume in this whole setup, so that my sound quality will be affected the least?
finally, at times i smell a slight burning smell when I play loud with my band, and I suspect its coming from my setup somewhere...is this normal?