I have a single din concert ( cd player) which i am converting into a double din unit and will be installing a pioneer avh 8400bt.

Does anyone know what harness and aerial adapter i will need to power all speakers?

I do not have a bose system, however, it does have a standard sub in the rear of the 55 plate sportback.

Also, is this the correct aerial adaptor?

CT27AA08 Audi A3 Aerial Adapter Straight Jack 75 Ohm.

Thanks in advance