Audi A3 8P 2003: Connecting Sony Radio to Replace Chorus, Rear Speaker Adapters & Audio Out

Good day. I need help with connecting Sony's radio, before it was the Chorus radio.
Thanks to colleague Leszek, studio24 and kabomani, I learned a little bit.
I connected the red and yellow wires in the black cube, the iso power supply and the radio is already playing, unfortunately after connecting the brown cube only on the front speakers.
Exits to the back are in this large black cube.
I read that they supposedly have their own power supply. That would explain why the back of the speakers is on a separate cube.
There are a lot of adapters on allegro, adapters only which one to choose?
In Audi, I do not have a BOSE system. There is nothing written on the speaker grilles.
I will add that on the radio I have an AUDIO OUT REAR output that can be used?
Which adapter will be the best?
Example http://allegro.pl/adapter-bose-iso-audi-a2-a3-8l-8p-a4-b5-b6-avant-i6752043951.html
Here, another http://allegro.pl/tylne-glosniki-subwoofer-modul-audi-a3-a4-a6-a8-tt-i5652244771.html
And another type http://allegro.pl/modul-audi-a3-a4-a6-a8-tt-tylne-glosniki-subwoofer-i6581110177.html

Moderated By damiancz:

3.1.18. Do not send links that will cease to be active after some time. This will make the discussion lose any sense.

Cubes in the car.


Radio.


Radio with iso 16-din

Hello, the back is active, goes from the amplifier which works with the factory radio. Use this converter which will drive the amplifier and start the rear speakers at the factory without radio.

I wonder where the amplifier is in the car.
Thanks. Yes, I will do it only, I do not know which one to choose.

son78 wrote:

I wonder where the amplifier is in the car.
Thanks. Yes, I will do it only, I do not know which one to choose.

The amplifier for the rear loudspeakers and the tube is in the tube itself, which is located in the rear left wheel arch. Choose the one I have uploaded, one of your suggestions, the second link.