These are 4 Magnum 12" subwoofers in ported boxes. In the pic there are screws where I had speaker grills on the boxes. The screws got stripped so I couldn't take them out. I have 2 of these boxes sitting directly behind my spot of the couch. They slam your back with music or movies. If I were you I would put all 4 subwoofers behind your couches and everyone can enjoy the back slam! Local pickup in Longmont, CO 80501. Here is a picture of one of the boxes... and a link to the subs online for specs and T/S parameters:
Denovo Audio Magnum-12 Woofer (diysoundgroup.com)
These boxes were flat packs from DIYSG so they are good well braced boxes and the right size for this subwoofer. Price drop to $450 local pickup.
