I believe these subs were designed for them by Dr. Hsu of HSU Research, so you are more or less getting the equivalent of one of their subs. The EX seems to have a different tune and is a tad larger (allowing it to go deeper and it has 3dB more total output), but appears to be the same driver and amp. You will get more "rumble" with the EX, but I don't think you would be sacrificing any sound quality. I've owned a HSU sub previously (VTF-2) and heard a few others and they sound great.