Speaker Wire Size

Ok and I currently am runnning 4 guage power wire which will shortly have two amps one with 2 25 amp fuses and the other with 2 30 amp fuses. Will I need to upgrade to a bigger guage or would this be good enough. It runs from the battery to behind the seats which isnt very far in a reg. cab truck.

 
Ok and I currently am runnning 4 guage power wire which will shortly have two amps one with 2 25 amp fuses and the other with 2 30 amp fuses. Will I need to upgrade to a bigger guage or would this be good enough. It runs from the battery to behind the seats which isnt very far in a reg. cab truck.
what amps are you running?

 
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