2002 B6 Cabriolet with Symphony head: all 4 speakers amped?

[ABA Cab]

I am new to this forum, had a swift scan and LOOKS GOOD!
I have just fitted this Erisin head unit to my late 2002 A4 (B6) Cabriolet, It has the Audi Symphony head unit with active/amplified speakers but NOT the Bose.

I understand I need Hi-Lo converter and see a number of specific harneses on e-bay but what is not clear is my car fitted with 4 (front and rear) amplified speakers or just active rears? This makes a difference to the harness I need.

Audi main dealer suggested all 4 speakers 'may be' amped in the Cab' but this is not clear. This is supported by the fact the front tweaters work when connected with my current lead (no hi-lo converer) hence will drive the tweeters which will not be amped!

PELASE HELP

 

[ABA Cab]

Just a follow up! Is this a hybrid speaker system i.e. the dash top speakers run straight off the head unit (not through amp) and the 4 door speakers run off the boot mounted amp? This appears to be the case.