| Re: sub in the couch
Again, there is no reason you can't put a sub box in your couch. You will find differing opinions about the sonic character of keeping the sub close to the sitting position. The "biggest name" I have heard of who supports the idea is Dr. Poh Hsu of Hsu subwoofers.
One concern I would have include how high off the ground your couch sits. You will want around 3-4 inches of floor clearance for your down-firing sub. A second concern is about the number of woofers and the size of your enclosure. The projected enclosure is 7.7 cubic feet. That amounts to less than 2 cubic feet per driver. This seems a bit small to me. Have you modeled this planned box? Most recommendations I can remember suggest around 3 cubic feet of enclosure per 12 inch driver. I have no experience with sub modeling programs, but there are others on this site who do. Perhaps one of them could comment on the proposed size of the enclosure or suggest a modeling program to let you "see" how the proposed sub would perform.
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