First off, I'd like to say hello, I'm new here. I just got my first BMW, a '95 540i, a couple weeks ago.
I'd like to install an aftermarket amplifier and sub. My plan is to tap into the rear speaker signals before the factory amp and connect them to the preamp inputs on the aftermarket amp. I've been researching this for a while and vaguely remember coming across something that said I needed some sort of converter for the signal, something about balanced signals and shielding I think. I apologize that I can't remember where I saw it or what exactly it was talking about. Do I really need something extra, or can I just connect everything as follows:
-Power from battery to amp
-Ground from amp to chassis
-Tap remote before factory amp, connect to remote on aftermarket amp
-Tap speaker signals before factory amp, connect to preamp inputs on aftermarket amp
-Connect amp to subwoofer
I plan to do the same thing outlined here: http://www.bmwe34.net/E34main/Upgrad..._subwoofer.htm
Also, what do they mean in step 6 of the install, where it says "RCA cable with individually insulated +/- wires as opposed to an RCA with the ground shield woven around the outside of the + wire"? Are there different types of RCA cable?
Thank you very much for your help.