i've got a four channel amp. it has 2 rca inputs. but i've got 4 wires on each rear speaker. wich wires do i've got to connect to have a signal to my amp. the radio is a 6000 cd rds and has no rca outputs.
You will have to buy a line level converter, which will take the signal from your speaker leads and convert them to RCA leads. You can find this at Wal-Mart or Radio Shack.
On the other hand, if you amplifier has line-level inputs (also known as high level inputs), then you can just connect the speaker leads directly to your amp. Read the instructions though, there is a certain way you have to do that, and your amp should have come with a wiring harness to do this if it has this feature. Not all amps have line-level inputs.