I have 2 12" mmats pro-cast in a sealed box powered by a jbl 1200.1 running at 1 ohm. The problem is, when it's playin loud and hits deep bass the amp turns of and back on and the red light on the amp comes on for 1 second. The sub also sounds like it bottomed out. I had the same setup in my old car just it was a ported box and it never did that? Is there something wrong with my amp? thanks