So I guess I expected a lot more nor do I understand the hype. I also messed up by doing my build with 12s instead of 18s. With four running on 8 cubes @ 28 hz on 3400 watts walled in a grand prix, I'm barely hitting 138 @ 31 hz on the dash. These get absolutely pooped on by a single 15 (Ive had an MTX 9515 and an AQ HDC3) or even two SA 12s on less power. Definitely a SQ sub. By far the best sound I've ever heard out of any sub, period. Might ditch these for two 18s SXs, tune them higher, and see how that goes.