Hi At the end of this month comes my new S3, which I ordered with the cheapest radio. The chorus comes in at ebay and I finally wanted to install a reasonable system, because I am a small sound fetishist.. Unfortunately I don’t know myself at all in the Car HiFi world and hope you can help me. I collected the following by reading all possible forums and threads:TMT Eton RS 160HT Recommendation?AMP Steg K4.01SUB Hertz Energy ES 380AMP Steg K2.01 As HU we d the Clarion MAX973HD Navi built in, with high-low adapter, because it does not have a preamplifier output. The Audi speakers come in behind, operated by the HU. Do I get all this so fully active, or is the whole concept garbage? I would be happy about every tip/opinion.. thx PS: Maybe I would let the whole thing be installed, because I don’t have so much time. Can you recommend someone in the area between Aachen and Cologne for this?