What is the specific name of this device and where on the net can I buy one and how much. I would like to bring everything needed to the installer so that he won't give me a hassle...H

 

converter for the stereo harness or the amp? i read your previous post that you were going to add an amp and a sub. if this is so, you do not need a converter. just tap into the rear speakers. but if you want a Line out converter, i used scosche....but i used this cuz i changed the bose amp with an alpine one. then for the sub, i still tapped into the rear speakers.

 

i used a monster cable in-line converter. you want to convert speaker wire into RCA's.