I am just about to change the front speakers in a STI7 and wondered if anybody knows which colour is the positive and negative in the front speakers, to save me having to take the head unit out to trace the wires back.

 

Doesn't matter, just be consistent side to side. Take each side off and see if there's something common, because sod's law says you'll forget what's on one side (yellow with silver flecks, for example) that'd match the other...