im not really sure what it is im new to car audio but i have four mtx twelves and a jl twelve w7 ive got them running on three differrent amps a t.ma. 250w, a infinity reference somwhere around 500-600w, and some shitty 200w amp i forget what brand......it seems to do this when i turn the volume up past 31-32 the hu is a kenwood....it will make a small popping sound and then the subs will stop beating or go in and out i....anyone know what it could be?//content.invisioncic.com/y282845/emoticons/wow.gif.23d729408e9177caa2a0ed6a2ba6588e.gif