is Head Unit power added to amp power?

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=35642
Printed Date: May 17, 2025 at 1:20 PM

Topic: is Head Unit power added to amp power?

Posted By: jakediggity
Subject: is Head Unit power added to amp power?
Date Posted: July 15, 2004 at 1:53 PM

When powering speakers with an amp, is the power of the Head Unit added to the power of the amp or is it lost. For example you have a 25 x 4 watt rms head unit running to a 100 x 4 rms amp, is the power to each speaker 125 watts or just 100 watts?

Replies:

Posted By: DYohn
Date Posted: July 15, 2004 at 2:13 PM

It's just what the amplifier produces.

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Posted By: kgerry
Date Posted: July 16, 2004 at 10:12 AM

just think of it as using two separate amplifiers... the one built into the HU or via pre-out the one you have externally.... one has nothing at all to do with the other.....

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Kevin Gerry
Certified Electronics Technician
MECP First Class Installer

Owner/Installer
Classic Car Audio
since 1979

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