i got this amp running 3 10" Kicker CVRs...4 ohm dvc i think....well the amp is an 850.1 but im not sure its giving the subs enough power for their potential...is this amp big enough for these subs or am i underpowering them? also, my subs are really really loud inside my car...louder than most other systems...my friend has 3 10" JLs and mine is alot louder...but outside my car it doesn't travel but like 20 feet...just wondering if this amp is supplying these subs with enough power