rca inputs

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=105291
Printed Date: May 13, 2025 at 12:11 AM

Topic: rca inputs

Posted By: pv13
Subject: rca inputs
Date Posted: June 06, 2008 at 1:54 PM

how would I go about testing the rca low level inputs on an amplifier. I need to find out if they are bad or not.

I have already tried the amp with different rca wires, and the only testing tool I have is a DMM.

Replies:

Posted By: i am an idiot
Date Posted: June 06, 2008 at 3:28 PM

What is the amp doing? Why do you think it is the Inputs? Short of bad connections, it is very rare to have a problem with the inputs of an amp.

Posted By: pv13
Date Posted: June 06, 2008 at 6:12 PM

The problem is that the amp powers up, but there is absolutely no sound.

Posted By: i am an idiot
Date Posted: June 06, 2008 at 6:54 PM

Set your DMM to the AC volts scale. Touch and hold the black meter lead to the shield of the RCA cable. Then touch the red meter lead to the center conductor of the cable. With the radio volume set to Zero, notice the reading of the meter. Turn the radio up to a decent listening level then let me know what the highest reading you see, play it for 20 seconds or so.

This procedure will tell you if there is audio coming out of your radio. There will be no way for you to check the inputs of the amp.

Posted By: badasschevillac
Date Posted: June 06, 2008 at 6:54 PM

have same exact problem just posted a topic on this should have read down a lil and saw yours...but yea i would like to know too

Posted By: pv13
Date Posted: June 06, 2008 at 8:08 PM

I already know that the rca cables work, because I switched the amp. I think that it is the inputs on the amp.

Posted By: badasschevillac
Date Posted: June 10, 2008 at 9:47 PM

did what u said (i am an idiot) and the highest reading i got was like .017 or .022 right as i touched them, then they went down to .001 and .002 im guessing that is my problem? i even did it to the rca subw output on the back of my headunit and nothin or the same as above.