watts/volts = amps

[Naxis2k1 10+ year member]

when doing watts/volts = amps

is the (watts) the rms of the amplifier(s)?

now for the other part of the question im wondering how true of a formula this is. In my case iam running a MTX 1004(4ch) & MTX942(2ch) with both of these amplifiers the sheet say they "may" draw more than 150 amps. so this formula seem more amplifier dependant?

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[Moe Lester 10+ year member]

amplifiers arent 100% efficient, so you have to factor that in as well.

 

[Spkrman]

fuse rating x10 is the easiest way to go

or wattage/10 to figure the current draw it would take to make that amount of power.