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Message: <blockquote data-quote="DidUHearThat?" data-source="post: 5603963" data-attributes="member: 594758">Forget about watts.  You need to calculate amps.  How many amps does your sub amp use, how many does your other amp use.  Add those together.  Is that less than 120 amps?  4 gauge wire will usually handle about 120 amps.  Does your fuse holder handle that much?  You need to know if can, or is 100 amps the max for the fuse holder, even though the wire can handle more.Then you can decide if your 4 gauge run will handle the load, or if it's time to step up to 0 gauge wire.  Class D sub amps are much more effiecient, use less power and can use thinner cable than A/B class amps.</blockquote>

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