After amp install issues

808 HI · August 15, 2020

Just had a audio shop install

-Alpine PDR V75 5 channel amp

-JL cs112tg-tw3 sub

-JL fix86 dsp processor

Previously installed Alpine type S speaker thru all the doors. Its sounds good but the only issue is the amplified sounds other than music -turn signal flicker, front and rear sensors and door chimes that also amplified. What was the fix for this issue?

Rodek · August 16, 2020

Go back to the install shop. You shouldn't be picking up feedback from your truck sensors, chimes or turn signals. Possibly a ground or signal ground loop issue.

808 HI · August 16, 2020

7 hours ago, Rodek said:

Go back to the install shop. You shouldn't be picking up feedback from your truck sensors, chimes or turn signals. Possibly a ground or signal ground loop issue.

The ground to the amp had been tapped into the body itself, below the seat on the front passenger seat behind the caps. Is there any other possibilities with this issue?

Velocity12 · August 18, 2020

I think those sounds play through the radio and that’s probably why you are hearing them amplified. I’m not sure there’s a way to stop it though, someone else with more knowledge might chime in.

Rodek · August 18, 2020

On 8/16/2020 at 6:46 PM, 808 HI said:

The ground to the amp had been tapped into the body itself, below the seat on the front passenger seat behind the caps. Is there any other possibilities with this issue?

If the sounds normally come through the radio, then I'm unsure of how to fix. If the sounds don't normally come through the radio (especially the turn signal noise), I still suspect a ground loop issue. Possibly with your JL sound processor.

808 HI · August 18, 2020

38 minutes ago, Rodek said:

If the sounds normally come through the radio, then I'm unsure of how to fix. If the sounds don't normally come through the radio (especially the turn signal noise), I still suspect a ground loop issue. Possibly with your JL sound processor.

Im sure that it comes from the factory HU. Noticed the same volume was also coming out when Siri is being used on Carplay. I talked to another audio shop and he was confident that he could resolve the issue by removing my Alpine bass knob and using a different knob to the processor instead of the amp and also adding resistors. He didnt explain the actual “fix” and said that he had to look thru the work first but was busy at the time and had to come back next week.