I'm aware that all of those come through my OS-4 and out the front speakers (wired normal- unchanged). What if I find a wiring diagram (color code) and swap (in dash) the wires for the front speakers to the rear speakers, then run my RCA outputs (for cleaner sound) from my new stereo to my amplifier to run my new front speakers? Then I will get the cleanest signal to the nice speakers in front, the rear speakers would play music, chimes, and retain Onstar. Does this sound right? I only want to do it once, it's gonna be a big, long project.

 

This may be a dumb question, but will the GMAHL1 work on a Trailblazer with the Bose 6 disc and RSE? I want to replace the HU, but want to retain the RSE.

 

Welcome to the forum.

Might get more response in the TrailBlazer section.