speaker shop?
 

Hi, guys, my brz is 2013 and it is always have some wired sound when i pass bump road, both side on the dash, and i back to dealer twice and sound still here, right now my warranty is expired and i want to upgrade it.

Anyone know shops can do the speaker upgrade near los angeles? i dont want OEM Audio, it is too expensive, and also i dont want some big shit in my truck cause i track my car, thanks guys!