ISO adapter harness for fitting a new stereo in an Audi A4, A4 Cabriolet, A6 or A8 with an original RND-D (Navigation Plus) radio with BOSE amplified audio system.

Also suitable for Audi TT built before November 2001 with BOSE amplified audio system.

This harness adapts from the original ISO and Mini ISO connectors at the back of the head unit to standard aftermarket ISO connectors. 

The harness has a built in high to low level audio adapter to drop the speaker outputs from the new head unit to a low line level signal to work with the original amplifier in the car. The high to low level adapter has 4 dials to individually set the levels of each audio channel to give perfect sound quality.

Loose wires for connecting the cars ignition and illumination supply are provided