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Despite what everyone else says and what you've probably read, the 4 gauge wire is definitely overkill. Unless you're dying to spend a fortune on power hookup, there are much cheaper ways to do that. Run an 8 gauge from the battery to the amp and a 10 gauge from the battery to the power supply. Then, you can use a pair of cheap fuseholders and standard fuses at the battery and then you don't need another fuse in the back. The fuse at the battery protects the car in case the wire is shorted against the chassis somewhere. The only reason to use a fuseholder/distribution block is so you can run one wire from the battery, because that's easier than running a bunch. You only need two and an 8G and a 10G together will be easier than running a 4G anyway.
Also, contrary to what most people believe, a fuse at the amplifier rarely protects the amplifier.
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Andy Wehmeyer
Product Marketing Manager
Harman Consumer Group
Mobile, Portable and Companion Products Division
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