Stereo setup:
Avic 710BT
JL 300/4 amp
4 alpine speakers at 75w each [dont remember the model]

I've had my stereo installed and working just fine for about a year now and zero issues until recently. My speakers on startup sometimes (not on every startup) make a very high pitch noise and then within about 10-20 secs they will pop and then be fine. Only happens once and then everything is normal.

Wire loose? bad ground? I just wanna hear some thoughts before I go rip my whole interior out and find out and not forget anything.

Edit:
My ground is hooked up to my passenger seat.


I think i might of found my answer. I didn't setup my rears with the crossovers that were supplied and the rears are trying to play highs when they cant.

 

it sounds like a bad ground somewhere, or a fuse issue. if it is ground to your passenger seat, did you first take the black paint off of the metal? that could be an issue.

 

either your pioneers pico fuse is taking a crap

or bad ground

 

ill check the grounds this weekend when i get free time. thanks