maybe i used the wrong word because it wasnt the box... maybe the tuning (tuned to 45hz for spl) but i didnt like the sound at all at high volumes... i did think it sounded clean at low volumes but once you turned it up it just got nasty. but after replacing the MT with a 05 XXX same box and everything i was much more satisfied... after i get a lower tuned setup i should be good with my XXX's but im looking for a SPL woofer to drop in the same box for comps