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12 or 14 volt current?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=56575
Printed Date: May 17, 2025 at 12:51 AM


Topic: 12 or 14 volt current?

Posted By: jdog0411
Subject: 12 or 14 volt current?
Date Posted: May 28, 2005 at 11:47 AM

This is probably a stupid question, but I've noticed different amplifier ratings based on the voltage that the amp is seeing (i.e. 40 watts rms at 12.5 vdc or 70 watts rms at 14.4 vdc). How do I tell what my voltage is in my system? I'm assuming that because my vehicle is pretty new, that my electrical system is putting out 14 volts? I have a multimeter, but wouldn't know what to test to find out. Thanks in advance.

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2004 BMW 325ci.
Alpine CDA-9885
JL 300/4 and 250/1
JL XR 5.25 comps
Infinity Kappa Perfect 12




Replies:

Posted By: dwarren
Date Posted: May 28, 2005 at 12:12 PM
Test the voltage at your amps' positive terminal with your meter.

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Posted By: DYohn
Date Posted: May 28, 2005 at 1:48 PM

You will operate at 12 volts with the car off as it's coming off the battery.  Most alternators produce 14.4 volts while the engine is running.



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