[Pop after key off]

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.

[My 6.4]

I wish it was a little louder. I don't plan to keep it. I was just curious.

[My 6.4]

I bought a 6.4 and replaced the RF t400.4 in my truck. I connected it to all the same wires so it was one of the few times I have done any work on my systems myself. It was an easy swap. The most noticable differance is that the 6.4 seems to have a lot less hissing and sounds clearer. The max volume sems about the same.

Are the clipping lights for the rca inputs or the speaker outs? I never see them on no matter how loud I turn up the radio.