Can anyone help? I've got a C70 that has the 901 3cd stereo + the 4 x 100watt amp as fitted. I want to also fit my sub amplifier and subwoofer to the OEM system. I have tried to take a signal from the 6 pin din plug that conects the head unit to the amplifier with no luck. The only alternative I can think of is to take a left & right signal from the head units own speaker plugs (not for the 6 pin amp plug), and use the signal as a high level input on my sub amp. (I could take the high level input off the rear speakers but I do not want to stop using them). Has anyone got any ideas?