Engine noise thru speakers
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=4009
Printed Date: May 17, 2025 at 6:13 PM
Topic: Engine noise thru speakers
Posted By: REDRABIT69
Subject: Engine noise thru speakers
Date Posted: September 27, 2002 at 10:32 PM
im running a 12" sub, 5.25" component set off a 4 channel amp. it all runs fine when the key is on ACC, but as soon as i start the engine I get engine noise which rises and falls with the revs. Ive tried moving the earth, moving the power lead away fom the other wires (not a huge distance away tho) and checking nothing is shorting out, seems strange that it would only do it with the engine going but is fine in ACC, any suggestions please! :)
Replies:
Posted By: SOUND PRESSURE
Date Posted: September 27, 2002 at 10:41 PM
Do you have the paint scrapped off where you have the amp grounded at? Is the ground the same size as the power wire? Check for breaks in the rca's or even having lower quality rca's can have that effect. Let us know.
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Sound Pressure
You know you have the right amount of pressure when your eyes start to water! Now you've got Juice!
Posted By: REDRABIT69
Date Posted: September 27, 2002 at 11:58 PM
Ive scraped off all the paint, the cables are the same gauge, and the RCA`s are new performance series ones, my mate said something about a little box (thats all, didnt know what it was :) ) that you need for some head units cos hes got one for his, I`ve never heard of it before, perhaps someone nkows what it is, and will it help? im pretty sure its not the wiring, as I`ve tried disconnecting the left channel, right channel, and sub seperately but still get the same thing, so maybe this little box thing (whatever the hell it is!) is the answer?
Posted By: SOUND PRESSURE
Date Posted: September 28, 2002 at 12:07 AM
Your answer would be a ground loop isolator.
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Sound Pressure
You know you have the right amount of pressure when your eyes start to water! Now you've got Juice!
Posted By: REDRABIT69
Date Posted: September 28, 2002 at 3:09 AM
Brilliant, I`ll give it a shot, cheers :)
Posted By: SOUND PRESSURE
Date Posted: September 28, 2002 at 3:18 AM
Good Luck!!  Let us know how it goes. ------------- Sound Pressure
You know you have the right amount of pressure when your eyes start to water! Now you've got Juice!
Posted By: Velocity Motors
Date Posted: September 28, 2002 at 7:40 AM
Another thing that you should consider is a low battery and a weak alternator. This is always overlooked when it comes down to ground loops as it's not a visible problem to most people. Get the charging system looked at or do it yourself, but make sure that your electrical system is getting atleast 14.4 volts while the system is running and 12.5 volts when the car is off.
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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: jamelk
Date Posted: September 28, 2002 at 11:04 PM
Check if your power wire and your RCA's are running down the same side. Sometimes enigine noise is caused by that. Try keepiing the RCAs and remote on one side and the power on the other. I think it is ok if they run the same side a little bit, but running them side by side all the way may cause that
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