Guys this may have been asked before but can you mix and match subs? Say you have two different subs with different power ratings/spec/size/etc could you use these as a pair or would the subs need to be pretty similar? Cheers, TR. EDIT. Right I now have two subs but don't really know where to start with setting them up using my Onkyo 818 and XT32. As we know the 818 will only eq one sub and treats the two subs as one. So what db do I set the sub's to? Any advice would be grateful received.