I have a 2000 Mustang GT with the Mach 460 upgrade. But nothing from the Mach 460 is still there except for the amps. The previous owner had it wired for subs but took them out before selling it. My dad and I have lots of experience with sound systems so we know what we are doing. I have a Kenwood aftermarket stereo with 4 matching kenwood speakers. Great sound! Every time I turn the car on I get a loud POP from the speakers. I have heard it's maybe from the amps or needs a fuse or something along those lines, maybe I'm wrong. Also on a side note, every once in a while, the bass cuts out on me COMPLETELY! I have to restart the stereo in order to go back to normal. Any help is appreciated!