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RE: Subs in the ceiling or under the floor

Posted by weltersys on February 19, 2012 at 08:34:17:
"Both crawl spaces have plenty of room for just about anything (big cabinets or even one of Danley's Tapped Horn contraptions)."

Parts Express has a relatively inexpensive long throw 15" specifically designed for what you would like to do.
Dayton Audio IB385-8 15" Infinite Baffle Subwoofer Part # 295-455

Depending on the SPL desired, you could use 1 to 4 (or more).
Mounting the speakers in a box (plenum) with the cones pointing at each other reduces floor or ceiling vibration, and puts the cone in a vertical orientation, generally a better idea to avoid cone sag. The outside of the box is simply left open to the basement or attic, the plenum exit can have grill cloth of the same color as the walls stretched over, the installation can be almost invisible, and takes up very little space.

I often think of doing the above, but my 2x12" sub is "hidden" in the record storage rack, and is adequate for the levels we listen at.