sounds like if i go for the 350 i'll have the same sub setup as you. not sure what model jbl you have but mine is a TLX PS10 i got at futureshop about a decade ago. I'll be putting the new sub to the left of the couch. not sure where i'd stick the other though maybe in front inbetween the tv and the right tower. i have all jbl studio speakers for my 7.1 setup. as long as i can get the full 18hz out of it.