It wasn't from the gains. I went with a friend and we metered two different boxes in two different cars. One box was his dual 10 inch alpine type r's with about 12 inches per cube and then his dd 2512s with about 17.5 per cube. The alpine box was fine in both cars, but the dd box was clipped like I have never seen before. By the way the box was a single chamber and gave about a total of 3.5 cubes net for both subs which is really undersized for those 12s in my opinion. Still not sure what the problem is thou lol.