Amp and Cap Drop Below 12 Volts

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=75473
Printed Date: July 07, 2025 at 1:54 PM

Topic: Amp and Cap Drop Below 12 Volts

Posted By: mobbmuzick
Subject: Amp and Cap Drop Below 12 Volts
Date Posted: March 31, 2006 at 7:14 PM

First when i would turn my system up to a certain level the voltage would drop to like 9 and my 4ch and mono would cut out and when i turned it back down everything worked fine. My friend told me it was my battery so i went out and bought a optima yellow top. Now at low volumes its like 13.5 but when i turn it up it still drops to 9 but it doesn't cut out. What did i do wrong that it's not a steady 12.

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Headunit : Alpine CDA-9855
Speakers : Polk momo 6.5 Components
Polk DB 6x9
Amps: Infinity 7541a 4ch
Alpine MRD-M301 Mono
Subs: 2x 10" mtx rt1004

Replies:

Posted By: forbidden
Date Posted: March 31, 2006 at 7:23 PM

Start by checking your grounds.

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Top Secret, I can tell you but then my wife will kill me.

Posted By: arrow12
Date Posted: March 31, 2006 at 7:40 PM

What are the amp ratings for those amplifiers and what is the car?

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That's my opinion. Take it, leave it, or correct me.

Posted By: mobbmuzick
Date Posted: March 31, 2006 at 8:02 PM

it's a 97 accord ex. mono is 350rms at 2 ohms and the infinty is 111 x 4 at 4 ohms (which i highly doubt but thats what it says) thanks in advance

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Headunit : Alpine CDA-9855
Speakers : Polk momo 6.5 Components
Polk DB 6x9
Amps: Infinity 7541a 4ch
Alpine MRD-M301 Mono
Subs: 2x 10" mtx rt1004

Posted By: geepherder
Date Posted: March 31, 2006 at 9:41 PM

What is the voltage reading at the battery compared to the amps (across the amp power/ground terminals) under these conditions?

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My ex once told me I have a perfect face for radio.