Hello All, Although I briefly mentioned this in another thread, I thought I would place it in a thread of its own and not little someone else's thread. The idea is using Quikcrete readi-mix concrete in a form to fabricate, in place, a subwoofer cabinet that is about as static as physically possible. This would be for the DIYer with no intentions of ever moving it. My HT room is in my basement. The stairwell has a landing halfway down (where it makes a u-turn), and the cavity underneath that landing forms a square box that is about 3.5' on the side/elevation. The space is pretty much useless for any and all other regards, and considering many have said and I've read that the idea behind a subwoofer cabinet is to make it as acoustically static as pissible. I have not heard of any DIYers that have done this, but I have seen pictures (wish I had their links now) of concrete-formed baffle systems for professional environments. I think the most difficult portion would be either forming the cabint in place and making necessary accomodations for the driver opening, etc., or making in a form and sliding the end result into place.