Bob - sorry i did not clarify. Most applications/equipment do not use 100% of the continuously rated RMS ( this is usually PEAK with tons of noise, not continuous)of the amplifier - on average about 38% of the continuous rating of a good amplifier is used if the system has subwoofers installed mixed with component sized speakers. Technically if the 4000 watts RMS is a real rating, then my calculation estimated that the amp are more than likely only using a max of about 1520 watts = 108 amps draw at 14 volts. I think the point i was really trying to make was that even in optimal conditions if the RMS ratings are real then 30 amp fuses are not enough and there are of course other factors, load on the amp, faulty equipment causing more draw by showing less resistance (shorts, bad output devices - usually fets of some sort, etc.). Anyways we really need more data to help Derek out like brand of amp, load of speakers connected to the amp and wire length to the amp to calculate the real draw of current.
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