I replaced the original Symphony II stereo with a Rns-e unit about 12 months ago. Ever since the base seems to be of very poor quality compared to the old Symphony II.
At the time of the install, i read up on what i needed and ordered the correct harness and ensured that the pin was grounded etc.
I think that the Rns-e unit needs to be told that the car has bose and the relevant settings altered to suit via the vag-com software.
I'm prepared to pay if there's anyone close enough to me - I'm in warrington, cheshire.
Audi A3 8P Sportback 2006 2.0TDi 170 Sline with trip-tronic