Can I tap the rear speakers without removing the Paanel?

 

you can either dig for the wires at the kick panels (lots of testing) or pullour factory radio and do it there. then you just have to run rca's back (im guessing you are adding an amp and sub to a factory deck). brown + yellow - for left, dk blue+ lt blue. - you will hve do do lots of testing to make sure that these are the right wires.make sure that you have a DMM.

 

Tap the front door speakers and tap both. Front gets more bass signal.

There is no way to get to any speaker wires without removing something.