Hello all, This is my first post in awhile.

Right now, my 2000 s4 has a completely stock system. I have 1 12" sub in a box along with a amp to power it. What other hardware will I need to buy to play this though stock HU? Also is it possible to put in a different pair of speakers in the headunit and power it by another amp? I'm not really trying to replace the Headunit. I want to work with that and upgrade everythig else.

My car audi knowledge is rusty and short, so I appreciate the help.

rca converter orrr ucan go this route http://www.a4mods.com/index.php?page=webcontent/pages/stereo.html&category=4 I personally went the rca route and tied it together with the door speakers. Works fine and sounds great. Any more questions lemme know.

Hi-Lo Converter

Amp install kit

Someone with some audi/vw knowledge since running wire in these cars is less than fun

And someone who knows where to find a switched accessory source for the turn on

How about for the speakers? What would be the best way to get some better sounding ones in there.. would i just need to connect them to an amp and wire them to the stock HU ?