ok well i have a coustic amp 400 watt. to 2 fosgate punch HE2 . they are ran normally. also a drive for voice. the coustic is only 2 channel they arent bridged or nothing. i got "4layer shielded monster" rca's really thick. i have the main 4 gauge power cable to the capacitor. and a ground from under the floor mat in the trunk to the cap and from the cap i ran the ground to the amps
the radio is grounded to a black wire with brown stripes. its skinny like the speaker wires. i honestly think its the HU