Audio Power Requirements

[EXSpeedAddict]

How many amps do head units and amps draw?
more specifically, a head unit (aftermarket, doesn't matter brand at least 45watts x 4 channels)
120wx2channel amp

thanks

 

[Akiahara96]

Well ohms law is the answer. So a 12o watt amp can consume 10 amps of current. Wattage divided by voltage. So google ohms law.

 

[Adam_Schwartz]

Also keep in mind that when looking at wattage ratings for amps and HUs, those are MAX output ratings, which you will likely never use. Might be a better idea to look at RMS output to determine a more likely amp draw.