we have been successfully using a non-subwoofer system for a couple of years, but the mains (2x qsc hpr122i) can't do it anymore. we need a sub. we're close to buying the qsc ksub, but we only want one. THE QUESTION is about placement: can i put it under ONE of the mains (i.e., to the side) instead of the middle? we are a pretty large band and space is at a premium. finding space for a stand-alone sub is going to be tough. and affording 2 subs is also not in the cards.