Replacing Symphony II, retaining factory subwoofer.


Registered User
Hi chaps.
What are my options here?
I have a Symphony II double din size head unit in a 2002 A3.
There is a factory subwoofer in the boot of the car.
I assume I can get some kind of double din blanking plate to fill the gap and fit a normal single unit.
Wiring this up to the power connections and the four door speakers is something I would be comfortable doing.
What about the factory sub in the book though?
Does it have an amplifier in it? Or was/ is the amplifier in the Audi Symphony II?

Has anyone does this? What's the best course of action?
All the best.