Do you know what the parameters for the WAF (placement size aesthetics)? There are things like under the couch subs (though this might be too much bass). Like the others have pointed out 3 inch seems a little crazy/ridiculus. If you have a a chance I would try to check out folded horn subs, I was amazed at the quality of bass these produced over my ported subs. Some good ideas here (ib, etc) http://www.diyaudio.com/forums/subwoofers/60504-another-small-subwoofer-thread.html