car audio: power block gauge question?

KooLgUy

New member
i think posted in the wrong section before:

i want to hook up 2 amps to my car. i have subs right now and want to install a 4 channel amp for my interior speakers. i am running 4 awg(gauge) wires all around from battery to cap to amp. if i use a power block, do i have to shrink down the 2 power cables to a 8 awg(gauge) from the block to the amps? or can i just leave it all 4awg(gauage) or do i have to upgrade the battery wire to a 0 or 2 awg(gauge) from the battery to fuse block?
 
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