wing
are you running speakers in all door(4)?
or channels bridged in front door?
you mention a sub,does it have it's own amp?

we're trying to get the setup right first,JT trust me the 540 has separate x-overs for front and rear. I THINK we know the problem already(since my old setup with tweets paralleled with infiniti x overs,smoked)but we need all the help so you can go back to the shop totally armed with info,hell,let them tell you what they want to do to fix it,come back,tell us and see if it computes,have 'em put it paper & read it as they wrote it,jt knoes a bit about car audio,i know a bit,my buddy's a pro installer,don't let them blow smoke(you know where)
we'll get cha figured out!

njoy til tommorrow past bedtime (way late)