WHY the idea of knocking down to 8 gauge out of the dist. block to each amp?!

I would, personally, get a distribution block that accepts 4 gauge in, & dual 4 gauge out. Then run 4 gauge out to EACH amp.

 

So much misinformation....

There is no 'code' for automotive wiring (like there is for home wiring)... hence, no reference provided

In a nutshell...

Fuses are there to protect the wire again a short circuit. What this means is you need a fuses at the beginning (as close to the power source as possible, whether it be the battery, the alternator or a distribution block) of each run of a given wire size with a fuse large enough to allow the total amount of current flow needed on that branch, but small enough to keep the wire from melting

Hypothetically, if you have 2 amps, each connected to a distribution block via 8 gauge wire, each requiring 30 amps, you would need a fuse (as close as possible to the distribution block.. or better yet, a block with fuses built in) around 40 amps ( > 30A). If the distribution block is being fed from the battery by 4 gauge wire, you would need a fuse very close (as close as possible) to the battery with a fuse around 80 amps (> 30A + 30A )

You do not need a fuse at the end of the wire (close to the amp) as it won't be protecting anything because the amplifiers have their own built in fuses

BBEngineer