subwoofer pops when turned 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=114504
Printed Date: May 11, 2024 at 12:29 PM
Topic: subwoofer pops when turned off
Posted By: AaronD81
Subject: subwoofer pops when turned off
Date Posted: June 16, 2009 at 8:39 PM
My subwoofer pops when I turn off the car, but not when I turn it on. Also, if I turn off the sub amp while it's still receiving a signal it doesn't pop. I've done some searching and found some info on delay circuits that keep the signal source on for a second or so longer than the subwoofer amplifier. The how-to from Crutchfield only describes the diode and cap, but the diagram shows a transistor and relay, which is correct?
https://www.crutchfield.com/S-Pl4IZ8wECqa/tech/kb327.html
Also, this post only describes using a diode and cap.
https://www.the12volt.com/installbay/forum_posts.asp?tid=7885&KW=turn+on+pop+velocity
Replies:
Posted By: i am an idiot
Date Posted: June 16, 2009 at 8:58 PM
What kind of vehicle? What year? Factory or aftermarket radio?
Posted By: AaronD81
Date Posted: June 16, 2009 at 9:06 PM
1998 Volvo V70, aftermarket head unit and subwoofer.
Posted By: i am an idiot
Date Posted: June 16, 2009 at 9:19 PM
Is the remote turn on of the amp connected to the Amp Turn on wire of the radio? 
Posted By: AaronD81
Date Posted: June 16, 2009 at 9:37 PM
I tried it connected to a switched wire from the car and the remote turn on on the head unit, no difference. So according to your diagram I just need the diode and cap?
Posted By: AaronD81
Date Posted: June 17, 2009 at 3:45 PM
I tried the circuit in your diagram and it keeps burning up (literally) the capacitor. The one I used was 470uf 35v based on the crutchfield explanation.
Posted By: i am an idiot
Date Posted: June 17, 2009 at 3:57 PM
You have the capacitor connected backwards. There shoud be markings on the side that signify the negative terminal. Make sure you have the negative terminal of the capacitor connected to ground. If it is heating up, this is the only thing that can cause that.
Posted By: AaronD81
Date Posted: June 17, 2009 at 4:09 PM
Thanks, now I feel like an idiot.
Posted By: i am an idiot
Date Posted: June 17, 2009 at 4:22 PM
Let us know if you get it working.
Posted By: AaronD81
Date Posted: June 23, 2009 at 1:46 PM
Works perfectly now, thanks.
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