Is your amp 1 ohm stable? Or is it just 2 and 4 ohm stable? Reason why I ask is because
my amp is 2 and 4 ohm stable and i had dual 4 ohm subs ( two L7 15s) wired down into 1
ohm's and they sucked alota power...
Even when the bass hit, with the aftermarket alt and Big III
and batcap, I was seeing my volt gauge drop down into the high 11's with the car in idle!!
Not sure if my volt gauge was too accurate tho..
Thats when i changed the belt into a goodyear gatorback and it did help the car from stuttering
when the bass hit, when i was in idle.. Anyways alota things can
play a roll to this, but i doubt its anything with your grounds being 2 and ah half foot long..
Definitley something electrical.. If ya have anybody in your area that
has the same subs, but dual 2 ohm's wired down into 2 ohm's, id put em in and
then you'l notice how bad your voltage drop is as compared to having dual 4's wired down to 1ohm..