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before i start i will just say that i DID search for this, but came up with nothing useful.

I want to "upgrade" my sound system, and want to know what gauge wire i will need for my 12volt source if im running 800watt power-amp/subwoofer.

right now im runing 2 12"subs, 300watts a piece, with one 300watt power amp. But i want to switch it to one 10", 800watt sub - with an 800 watt power amp. - the wire im using now is 8 gauge

help is appreciated

 
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if you're gonna bump it up to 800 actual continous watts, then go with 4ga. its better to have headroom for future upgrading.

 
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^^ I agree, i'd probably run a 4ga myself.

 
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yup, never hurts to go bigger, if its 800 rms, than yes you defenatly need 4 gauge wire, if its only 800 max, than the 8 gauge would be good enough, but your better off getting the 4 gauge

 
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It all depends if it is 800 rms or 800 max..
But it never can hurt to put a bigger wire, but it isnt necessary if it is 800 max.

 
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go with the 4 gauge for sure

 
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4 gauge no matter what (in your scenario)

 
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4 gauge!