Brian, why not try your EP350 in that spot 1st to see if it is a 'bass friendly' spot?

FWIW, I have my EP500 behind my couch and aside from being one of the good spots when doing the sub crawl, it has the tangible benefit of real tactile bass through the couch. We can literally feel the dinosaur steps and the like through the cushions.
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Dan
In/On Wall 500 w M2 Center Channel