I think there are more of us without a dedicated HT than there are with one.
Yes close proximity can create boominess, I find when I run a 40hz crossover I get boomy bass, actually more of a peak in that range according to REW graphing, anything above that seems to work ok.
I have run the M80s upstairs where I have more room for them to 'breathe' and they have a wider soundstage and the bass is less prominent, still smooth and noticeable, perhaps I just get used to the room re-inforced bass I have in the 'bassment'.
