sub staying on and making continuous bass note after i turn the car off

[lilred]

Hi. I searched forever and ever to fix this and decided to make a post asking for help.

I just installed a Alpine m500 amp in my 2011 VW Golf with the stock head unit. It works great but when I turn the ignition off, the sub just makes this very loud bass note that does not stop as far as I can tell. I can only stand to listen to it for about 20 seconds and I don't want to bother my neighbors. The light on the amp stays on during this. This doesn't happen when the gain is turned to a quarter of the way up and the bass EQ is at +4. The light turns off when these are lowered when i turn the car off.

The amp is wired with high level inputs using both rear speakers on the channel 1 and 2 spots on the amp with the 3 and 4 left open. There is no remote wire, the amp picks the signal up through the high level inputs. I did hook the remote wire up to a confirmed switched 12V and there was no difference. The ground is hooked to the seat bolt and its sanded nicely.

I just want to say it works fine with the gain and bass EQ turned up with the car running, this only happens when i turn the ignition off.

I had it wired using RCA jacks and a remote wire hook up in an 85 4Runner and it worked flawlessly. The system only about 6 months old.

Thanks in advance for any advice with this, I hope i included enough info

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[argenis69 10+ year member]

I believe you have to check the high level inputs to see what is causing a continuous power.

 

[CrossoverOre 10+ year member]

My guess is that the factory amp or the sub and speaker "talking" to each other keeping the amp on causing bass from the sub. Kind of like a singer putting the mic to close to the speaker and causing feedback. I would get an loc with a signal sense turn on use the rca ins on the amp and call it a day,.

 

[lilred]

Thank you i bought a cheap $10 loc and hooked up my remote wire and it did the trick. thanks man //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif