Pop after key off

[HDanielh]

About a second after I turn off my car there is a popping noise as the system shuts down. Clearly audible but not real loud. I think it may have something to do with the 3sixty.3 problems I had. Some kind of power feedback?

current system,

I left the factory system in the car with only one center dash speaker because of the number of things that touch screen controls and does., nav, sirus link, ac/heat controls and even how lights work in the car, ect.

Current system mostly Rockford Fosgate ;

PMX-2 head unit because it fit in a spot I wanted to put it.

t2500 on 2 psi stage 3 subs

t1000.4 bridged for front doors pps10-4

t1000.4 bridged for back doors pps10-4

t600.4 for door tweets pp4-nt

t400.2 for dash memphis mojo tweets

3sixty.3

audio control in dash epicenter

audio control four:one

RF 10 farad cap

4/0 big 3 plus 2x 4/0 to trunk

Rockford and Knukonceptz wire

3x optima red tops

320 amp alt

Everything sounds awesome. The only problem is that pop when I turn off the car. I was hoping that would go away with the new head unit but it is unchanged.

I tried without the cap.

I made sure all grounds are good, bolts/nuts, scraped paint, tight everything with every battery grounded to the car body and the underside of that bolt going to a bolt in the frame with a 1/0 just to be sure. None of my grounds have over 5 ohms resistance.

Edited October 11, 2016 by HDanielh

[ShadeTreeMechanic]

Do all the speakers make the pop or just the subs? Try unplugging the rcas from the amps that pop to see if it is coming down the rca line.

[bsneon98]

x2 is it just subs?

[Soccerballzs]

you are using a 3 Sixty 3 for sub plus a Audio Control Epicenter? If so lose the AC Epicenter and see if it stops. I would only run the 3 Sixty 3. Do away with unwanted fixtures.

[Rich Schenk]

Start bypassing equipment and see how if it goes away could be epicenter or audio control 4. Where our u hu, epicenter, and 4 grounded too, where our your amps grounded 2?