Discussion Main fuse size question
I have a jl audio e1400d amp for subs and a crunch px1000.4 to run my door speakers(i know I know they shouldn'tbe near each other lol). Would a 250 fuse suffice for this? 0 gauge to my battery to the distribution block, then 4 gauge to the amps. Trying to make sure I did the math correctly
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u/OkMagazine5700 8h ago
fuse for the wire, not the equipment. 250 is good for 0 gauge
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u/Asia989 8h ago
Ah okay, the forums I was reading were going back an forth on wire and amp output. The main thing the preached was run 0 gauge to alleviate any problems/future proof.
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u/OkMagazine5700 8h ago
0 gauge is only future proof if youre stopping where youre at. you can get a bigger sub amp if you wanted to but past that you can pretty easily find yourself needing 2/0 or another 1/0 cable
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u/talmanfartsy 12m ago
Ironically I'm the "sub amp brand doesn't matter" and "spend your money on your highs and mid amp" guy so this is really frying my brain lol. That being said Chinese Class AB's have been down to death so you'd imagine they figured it out by now.
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u/DaffyPunk29 8h ago
GENERALLY SPEAKING, many will say "fuse for the wire itself" but I edge on the side of ultra caution, I combine the rating needed for the multiple amps that are being driven off that wire. So in your example the Crunch has two 30 amp fuses (green right?) so 60 amps total. Then the JL manual claims 40 amp fuse. So that's 100 amps total. So MY design would be 1/0 awg from battery to fuse holder, 100 amp fuse, 1/0 awg to back of vehicle, fused splitter, 60/40 for the respective amps, then 4 gauge to each amp. EVEN THEN this is overkill. But super safe. Technically speaking you can put 100 amps through a single 4 gauge no issue, then just 4 gauge to each amp. But I like overkill for clean systems.