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loud noise coming from sub after car turned off??

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Old 01-19-2006, 03:17 PM   #1
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loud noise coming from sub after car turned off??

whenever my gf turns off her car, there is a loud noise that comes from the sub. it's a 12" JL sub and i did all the wiring but can't figure it out. it's hooked up to the stock deck with an rca adapter. the last time it happened i changed the ground for the amp and it went away for a little while but it came back now and it's wired exactly how my truck is but my truck doesn't do this. anyone had this problem before?
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Old 01-20-2006, 03:08 AM   #2
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Re: loud noise coming from sub after car turned off??

this happens with a lot of stereos. its just your sub popping from the power being turned off from your amp. i wouldnt worry too much.
Old 01-20-2006, 03:17 AM   #3
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Re: loud noise coming from sub after car turned off??

mine does it too whenever i change stations or something, its not real loud, but it does pop. i dont think it is too serious though
Old 01-20-2006, 03:28 AM   #4
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Re: loud noise coming from sub after car turned off??

its just feed back, get some better rca wires and or make sure the ground is grounded real well.
Old 01-20-2006, 12:21 PM   #5
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Re: loud noise coming from sub after car turned off??

That is a type of ground noise. What kind of amp are you using and also on the high to low converter there is a brown ground wire comming out of it. If you havn't grounded that wire you might wan't to try that. I came across this noise alot in my 9 years of installing and found it most popular with either lower brand stereo's or amps.
Old 01-20-2006, 04:25 PM   #6
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Re: loud noise coming from sub after car turned off??

yesterday i turned on the car and the sub just started to blast and it wouldn't turn off...and the radio wasn't even on. so i had to disconnect it. it's connected to the stock deck with an rca adapter. do i have to ground that? i'm going to try and sand down the point where i grounded the amp better.
Old 01-20-2006, 05:19 PM   #7
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Re: loud noise coming from sub after car turned off??

no, I'm not sure what it is but my buddy's car has the same problem. I rag on him all the time about it. You turn off the factory unit, and the subs just go apeshit. Like one long continous hum. It's funny
Old 01-20-2006, 05:19 PM   #8
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Re: loud noise coming from sub after car turned off??

but it's on a Celica
Old 01-20-2006, 07:29 PM   #9
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Re: loud noise coming from sub after car turned off??

http://www.stingerelectronics.com/we...lectronics.asp


The very bottom item is a pop stopper and should solve the problem. I'm sure other places sell them.
Old 01-20-2006, 07:32 PM   #10
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Re: loud noise coming from sub after car turned off??

is that pop you're talking about really just a pop (like a short burst)? because the noise i'm hearing is kinda long. the last time it happend it went loud and didn't stop so i disconnected the subs.
Old 01-20-2006, 07:35 PM   #11
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Re: loud noise coming from sub after car turned off??

I have a buddy whose subs "hum" when he turns the car off. Is that what your talking about?
Old 01-20-2006, 07:39 PM   #12
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Re: loud noise coming from sub after car turned off??

mine goes "pop" its about 1/4 second long, whenever i change stations or turn it off, but not when i go through CD numbers
Old 01-20-2006, 07:45 PM   #13
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Re: loud noise coming from sub after car turned off??

Quote: Originally Posted by andocommando
mine goes "pop" its about 1/4 second long, whenever i change stations or turn it off, but not when i go through CD numbers
Look at the link I posted above. The last item on the page is a "pop stopper" and it delays the amp turn on/off so you shouldn't hear it anymore.
Old 01-20-2006, 08:17 PM   #14
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Re: loud noise coming from sub after car turned off??

what it is is a feedback through the rca's when u turn off ur radio, ur amp didnt turn off.. its actually stil processing the signal. unfortunately i've yet to find a good way around this. we had a customer come back and complain about this but unfortunately there was nothing we could do to correct it.. we tried changing where we go the amp turn on to using a different LOC and it was even grounded.. so in short, just dont turn ur radio off
Old 01-27-2006, 11:33 AM   #15
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Re: loud noise coming from sub after car turned off??

The high to low converter needs to be grounded. Its the brown wire on the converter. That noise is feed back.
Old 01-27-2006, 12:03 PM   #16
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Re: loud noise coming from sub after car turned off??

Quote: Originally Posted by 99ExtremeSS
I have a buddy whose subs "hum" when he turns the car off. Is that what your talking about?
Yeah, but the car don't have to be shut off. When the entire car is off it don't, but when it's on and he turns the HU off they go crazy, lol
Old 01-27-2006, 01:20 PM   #17
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Re: loud noise coming from sub after car turned off??

I have same problem, and still cant figure it out. I may try a ground loop isolator and see if that works.
Old 08-15-2011, 04:22 PM   #18
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Re: loud noise coming from sub after car turned off??

It won't harm your subs unless the noise is much louder than normal. Yeah its annoying, but if your amp has a 'gain' knob, you can turn that down everytime before you turn off your car, and it won't happen. I run 2 12' p2's and the noise is so loud sometime it vibrates the hair on my goatee, but its normally that loud anyway
Old 08-15-2011, 08:50 PM   #19
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Re: loud noise coming from sub after car turned off??

i would re-ground deck and also ground rca's , beandip had same popping proplem and it ruined the voice coil on his FI....he had to re-cone the sub
Old 08-15-2011, 11:49 PM   #20
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Re: loud noise coming from sub after car turned off??

wow, first post a an OLD DIG!
Old 08-16-2011, 12:20 AM   #21
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Re: loud noise coming from sub after car turned off??

why not , everyone else is.............
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