aal2000

Just a few questions about carpc audio. I have already installed my carpc in a e46 2003 bmw limousine with no amp and just bmw radio business CD in the front. I put the radio in the glovebox extending 17 pin iso adapter cables. I have aun aux input in the radio. What I have done with carpc audio was to run a single stereo cable from the trunk to the front where I have the aux input and connect that cable to it. I have tested the audio and it was terrible. A lot of RF noise. I have read all the posts about carpc audio installation and I have a few questions that maybe you can asnwer me:
1.- Does the SVEN4 installation work with no amp? I would like to know if I can connect the SVEN4 LOC to my radio harness and send the 4 channel RCA to the trunk. Will I need a amp to do it?
2.- What type of coax shielded cables do I need? is it better to run the audio cables far from all other carpc ones?
3.- RF noise can be reduce grounding all cables to the same ground point? Does SVEN4 black cable have to be grounded in the same point?

Well, I am a bit frustated beacuse I have spent a lot of money in the installation and audio does not work well and it is a key point.
Thanks in advance