"pop" when turning off

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=12280
Printed Date: August 22, 2025 at 9:48 AM

Topic: "pop" when turning off

Posted By: mdboy76
Subject: "pop" when turning off
Date Posted: April 16, 2003 at 2:42 PM

just installed my gf old headunit to my car. and re-done all the wires to my needs since i'm putting in a equalizer pretty soon.

here's my connections.

first, at the back of the headunit i have front/rear rca outputs. the front rca goes to the mtx amp which connects all my front/rear speakers and the rear rca goes to the other amp that runs my subwoofer.

for the amp's the grounds are connected to one grounding point and i bridged from amp to amp. also the lead turn-on.

the rca's are ran in the driver side and the power cable in the middle of the car.

what's causing this problem. tia and diagram is appreciated

Replies:

Posted By: wvsquirrel
Date Posted: April 16, 2003 at 10:24 PM

Am I following you correctly here... You ran amp1 ground into the amp2 ground and then to your ground point?

1) Check your ground for the headunit. Make sure it is secure and ran to bare metal (not just to something metal in the dash).

2) If your amps are chained like I asked above, get a distribution block and run seperate grounds for each amp to that block, then to your ground point. Again, make sure the ground point is bare metal and on the frame of the car (not a parcel shelf or something like that)

3) Your amp(s) could be shutting off at different times then the headunit. If this happens you get feedback in the amp and that signal gets sent as a "pop" type sound in the speakers. Try running seperate remote leads as well. Some amps do not like daisy chaining (just like with the grounds), and it could affect performance.

4) Check the output voltage of your remote lead with a DMM if your able and post the result

5) If your amp(s) are turning off after the headunit (and not at the same time), you could also install an "on/off" switch or relay to the remote line(s) to manually turn them off before the headunit. What usually happens is when the headunit turns off, it cuts power to the remote lead(s) and RCA pre-outs. If the amp has not discharged it's power before it loses the RCA signal then the feedback/popping can occur.

I'm sure I've overlooked something... anybody else?

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com

Posted By: Velocity Motors
Date Posted: April 17, 2003 at 12:55 AM

Relay isolate your remote turn on lead and source it from another 12 volt source. Just a thought for you at 2:00 am

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA