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subwoofer pops when turned off


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AaronD81 
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Posted: June 16, 2009 at 8:39 PM / IP Logged  
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?
http://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
i am an idiot 
Platinum - Posts: 13,693
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Posted: June 16, 2009 at 8:58 PM / IP Logged  

What kind of vehicle?  What year?   Factory or aftermarket radio?

AaronD81 
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Posted: June 16, 2009 at 9:06 PM / IP Logged  
1998 Volvo V70, aftermarket head unit and subwoofer.
i am an idiot 
Platinum - Posts: 13,693
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Posted: June 16, 2009 at 9:19 PM / IP Logged  

Is the remote turn on of the amp connected to the Amp Turn on wire of the radio?

subwoofer pops when turned off -- posted image.

AaronD81 
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Posted: June 16, 2009 at 9:37 PM / IP Logged  
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?
AaronD81 
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Posted: June 17, 2009 at 3:45 PM / IP Logged  
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.
i am an idiot 
Platinum - Posts: 13,693
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Posted: June 17, 2009 at 3:57 PM / IP Logged  
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.
AaronD81 
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Posted: June 17, 2009 at 4:09 PM / IP Logged  
Thanks, now I feel like an idiot.
i am an idiot 
Platinum - Posts: 13,693
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Posted: June 17, 2009 at 4:22 PM / IP Logged  

Let us know if you get it working.

AaronD81 
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Posted: June 23, 2009 at 1:46 PM / IP Logged  
Works perfectly now, thanks.

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