Speaker cable 9 conductors of 6.1 m
If you need to mount an additional amplifier in the car's trunk and want to pull the connections up to the original connector behind the car radio, then this cable is a brilliant solution.
With nine conductors, you can simultaneously draw a signal to a total of four speakers as well as a control current/remote. It is easier to pull through the car, easier to find space for and easier to see.