Parrot mki9200 and loud popping

[mrandyt]

I have installed a parrot mki9200 in my audi tt and it works a treat however when I either turn the ignition on or off the speakers make a popping sound and quite loud like the amp is suddenly kicking in, I have used the correct wiring harness but something is definitely not right, it is the rns-e half bose system.
Ideas please? I've ran out of em

 

[perry30sport]

never heard of this before in a tt, what cable did you use?