I’m in the interesting position of telling you how to do something with a subwoofer that you shouldn’t do. No, it’s not illegal. But in the ears of those for whom sound quality is more important than ergonomics, décor, and/or domestic tranquility, it’s definitely heretical.
So let me say at the outset that subwoofers are finicky beasts, and a change as small as a matter of inches in the placement of a sub in your room can make a difference between bass that sounds boomy (or wimpy), bass that sounds good, and bass that sounds great. If you have the room in your room—and the willingness—to put a sub (or, better, multiple subs) where the bass sounds best, then there’s absolutely no reason to do otherwise.
See on www.soundandvision.com