Question about Sony Xplod XM-1652Z Car Audio Amplifier

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How to measure watts

How do i measure the exact watts going to my sub woofer in my car. The amp I am using is a sony xplod xm-1652z amp. I have a light connected in between the amp and sub and want to know what watts the light is receiving

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You need a Volt Meter and an Ohm Meter. P = VI & I = V/r, so Power = (Volt^2)/Ohms .

You can get the ohms by hooking them up to the subwoofer input wires, and you get the volts by hooking up to the amp output terminals/wires. Although, amps will put out different voltages for different frequences, this should give you ballpark estimates.

Posted on Dec 21, 2008

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