Ok the 3 sub setup is pounding quite nice, all 3 Audiobahns are getting along: Ive wired them one voice coil from each sub to an amp and the box used to be ported with a simple hole drilled out the back but since Ive sealed the port and did a leak check the quality of the bass is just amazing!! The box everyone is in is open inside so they all share the same 4.5 cubic ft of air. Another question Id like to ask if I can get away with it is, the box is made from MDF and I want to fiberglass the inside and repair the subwoofer mounting face (the part where you screw in the subs) cause Im just not getting that resistance when I push the subs inward (not a perfect seal). I guess is it a good idea to fiberglass the box or should I just use some clear silicone all around the joints??? Am able to do great fiberglass work.