Replace factory rear-speaker amp - what will the factory wiring take?

[A4 stu]

My current B5 is a 1998. It has the standard Audio radio with active rear speakers.

Can anyone tell me which fuse(s) is for the radio and the rear speaker amp please?

The owners manual lists:

37 - Telephone (D-net), radio ...... 20 amp

43 - S-contact (central locking, radio, navigation system)........ 5 amp

I have checked the car and only the 20 amp fuse at 37 is present. There is no fuse at 43. My car has central locking and a radio but no navigation system?

So it seems this fuse is for both combined?

20 amp seem a bit high purely for a radio/tape unit? But when I remove it the radio does not work and I can only assume the rear amp is deactivated too.

Basically I am looking to replace the rear amp (and speakers) and could do with knowing what size amp/wattage the factory wiring would take.

I have an old school Pioneer GM620 amp which I think was fused with a 4a fuse and only rated at 2x17w(35w max) so was thinking of trying this or something similar.

Stu.

 

[Samuel c5 Q]

Is that 17 rms or peak to peak as a lot of the manufacturers claim? That's just under 3 amps current draw. I couldn't see the factory wiring having a problem with that. I think I was drawing 9 amps or so through the cigarette socket with no issues when running a transceiver and amplifier.