Can anyone tell me what colour wires go to the rear speakers from the amp in my A6?

i wonna by pass the ****ty Audi Amp..as its only 2x20W and my head unit it 2x50W so its unbalanced...

i think i just need to run wires from the speaker output on the H/U to the boot

cut the rear speaker wires off the amp connection and join then to the new routed cables...

just need to know what colours guys?

any idea?