Adding back / rear speakers to a system with no speakers or plugs
SOURCE: Audi Concert problem
you must check wiring cable of left speaker-reconnect antenna cable and check if it is firmly connected and apply contact cleaner over faders.
SOURCE: 1998 Audi A4 Quattro rear speaker wiring
You can't use any of those - the large connector at the OEM speakers is because the rears are amplified. Your factory head unit puts out a line level signal to the rear speakers. There's an amplifier on the driver's side rear speaker (the box around the magnet that you can see from inside the trunk).
You need to either replace the head unit with an aftermarket one to drive your new speakers, or you need to tap into the amp connector and find the line level wires, break them out, put RCA plugs onto them, and plug them into an aftermarket amp, which you'd use to power your rear speakers. Doing it that way allows you to keep the factory head unit.
SOURCE: Rear speakers in audi 1999 audi a4
You don't want to fit that - it's the factory amplifier for the rear speakers (the rears are amped, the fronts are not). You need to run new wires from the head unit back to the new rear speakers so that the speaker-level outputs from the new head unit are used to drive the new speakers.
SOURCE: Radio wiring problem 2001 Audi A3
Hi, had total issues with this too! Your back speakers arent going because they are amped by the factory amp in the boot. You have to provide power to the amp so that it will turn the rear speakers on. This was a white and black striped wire in my car (Audi A3 1997) The rear speakers are blue /green and brown/red (left rear) , and the LH rear is brown/red and (forgotten colour) but the wire on the bottom left under those two brown/red wires on the 20pin harness. If you wire it all up like this then your rears should be going :)
Testimonial: "So sorry for the very long delay in replying to your advice. It was the sub/amp in the boot as you correctly guessed. Another £200! Many thanks Pal"
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