Diamond Audio DMD124SH - 12" 4Ω Shallow SubwooferDMD124SH 12" 4 Shallow Subwoofer Look no further if you are seeking a solution when challenged with space limitations for adding bass to your car audio system. The Diamond DMD shallow series subwoofers measure in with only 3 inches of depth and perform best in sealed enclosures performing just like a conventional full size subwoofer but taking up less space. For optimum bass response, we recommend using two DMD shallow subwoofers in a narrow 1 cubic