Well i had a terrible problem with this on my cali profile 2 ch amp. Would have a whine that would alternate with the rpm's. I took the amp and speakers out a while ago because of this. I just did the figure 8 and regrounded my sub and front channel rca. I havnt tried hooking up the cali profil because i am pretty sure i am getting a new kicker for christmas. Is there anything else i can do besides buy a new deck and this figure 8 with copper wire to help solve this problem?