Recommendation for size of subwoofer and placement (1 Viewer)

[Daniel Simon]

Ok, I have settled on my mains now - PSB Image 2B (this will be for a more 'budget-orientated' HT setup). I plan to add a pair of PSB Image 1B speakers for my rears, and the Image 8C for the center. That would then leave the subwoofer. I was previously thinking about getting a 10" one. But now I'm wondering if that is the right choice, or would it overpower my compact setup? The room size it will be used in is about 14' x 16'. Should I consider just getting an 8" subwoofer instead or stick with a 10"?
Second question: my entertainment center is rather large and crosses a corner of the room diagonally, instead of sitting adjacent to a wall. This leaves a fair amount of space between it and the corner (large triangle). Would it be ok to sit the subwoofer behind it, or would it dampen the sound too much?

 

[Len Cheong]

I don't think a larger sub would overpower your mains since the sub will be responsible for frequencies below 80Hz anyway. That being the case, go with a larger sub if you've got the cash. The question may be, do you want a sub that goes down to 20 Hz? 10 inch subs mostly go to just below 30 Hz. If you want to go to 20 Hz, then go for a 12 incher.
As for the behind the tv placement, that's where my sub has been ever since I bought it. No problems so far. It may even increase the output of the sub given that it's in a corner.