Most likely the reason that the Audi dealer isn't saying anything is that they have no idea.
I did order the BOSE amp, but I eventually got a cancelled order so I ended up with the cd player and no BOSE. Feelings on the web are that the BOSE option isn't as good as you might think - do a search on
http://www.audi-tt.org.
Personally I'm very happy with the sound system that came with the TT - and I'm sure that the amp/empeg combination is going to sound great!
Only a week to go......
Paul.
Paul Haigh, 6GB, Blue
Reg: 4120 - Serial 00254
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Paul Haigh, Reg. 4120
(mk1) 6GB, Blue, 00254
(mk2) 12GB, Red, 00357