Help and advise needed as its really annoying. Car is a 2010 Sportback Black Edition with Bose Have only had a little over a month. Retrofitted RNS-E - No Problems Followed by Bluetooth - No Problems. Over the weekend installed stealth sub and amp from AndyMac. Sounds Awesome but had alternator whine and rear left speaker didnt work. Perhaps rear left channel faulty. Went to breakers and tried exactly the same amp. Now both rear speakers dont work. I tried my original amp in another A3 and all the outputs are fine. Now I disconnected the new sub and amp. All speakers work fine now however I still have whine which wasnt there before the install. Its especially bad when I accelerate, use the brake pedal and when I use the indicators. Any ideas from anyone? Will be going to a mates and plugging VCDS to see if it brings up any errors. p.s The bose wiring was spliced into to get the feed for the new amp. Remote and RCA. The power wire is still in the car but disconnected as well as the earth wire. HELP NEEDED!