Hi I have bought a Lexus is 200 sport and was fitted with an mp3 player but the speakers in the back window didnt work so on tracing the problem i found they were never connected to anthing so I tried to wire them up and i know there are 4 cables going to the old speakers I know one set is 4 ohms and the other 8 ohms so What i want to know is which colour should i connect the speakers to so as to get the best possible sound,