i've had my IDQ v2 10" 2 ohm dvc sub for several months now. they're sealed in a .66^" box. they're getting 150w wired in a series.

i noticed in recent days, they're starting to "bleat" thats the only word i can think of to describe it. kinda like "brbrbrbrbr" that makes your fronts sound as if a fan is blowin in front of it, when solid bass notes hit. er that helicopter noise effect...haha whatever.

at first i only listed to my fav rock records so there weren't any solid synthesized bass lines to stress it, just kick drums/percussion, and stuff, so the bass was really nice and tight, accurate. recently, i finally got around to bumpin' some of my rap/pop records and they're somewhat vibrat-y.

is this a gain thing? is this just a phenomena of a sealed box? did i fry my voice coils? i've had it crossed at around 65~ hz for a while and that x-over pt seems ideal so...

thanx!