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Originally Posted by
EagleDon 
Iam thinking about placing a small sub on my bottom shelf of my componet rack. the sub would have to be less than 12 inches in height , 18 inches across and the shelf is glass. My speakes are only 25-30 inches apart so the sub would be between them. Is there a problem with this set-up?
The good news, pretty much, you can place a single sub where ever you choose. A corner position on the floor is a better position then a glass shelf as glass shelves are fragile and subwoofers are heavy; especially when combined with a pair of speakers and the subwoofer is placed in the middle. And considering possible vibration issues, subs on glass shelves can come to catastrophic endings. The good news, if it does break, being on the bottom shelf, one only has a single shelf's worth of glass shards to clean up.

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Yea, I know my speakers are too close, about 32 inches, but I can't really re-arrange my bedroom.
Toe the speakers out an inch or two as opposed to focusing the sound field of both speaker's output at the same location. Kills the focused sound stage affect but the trade off is a "HUGE" sound stage. One doesn't sit in one location in a room but moves around. Sometimes even dancing when nobody is looking to improve one's moves. Having the speakers toed out an inch or so, enlarges the sound field and is like real world venues as opposed to the pseudo world of a micro focused sound stage that exists only when two speakers are focused at one location.
Either which way, be wary of subwoofers that aren't very big and powerful and going small and compact means giving up headroom and in my opinion, subwoofers are all about the headroom that accompanies everything else. In the short, no headroom, game over.