IF I DO have this amp for door speakers, and I am not convinced that I have either, then:

1 -- How do I find this amp

2 -- How do I get the door panel off to see if I have speakers (YES, I DO have the speaker panel/grill in the door) but I have never had sound there, so I thought that it was an option to have the speakers but they weren't installed.)

3 -- If I wire direct to the front speakers, then hookup to the original front inputs (to go to the amp via the fader) then bypass the fader for the back speakers -- where is this black remote amp on switch?

Thanks, Phillip