Thanks guys for all your posts. It certainly put me off putting all the sound through the mono original left hand speaker. So I now have 2 new speakers in the back and the original speaker is also wired up as front left. Only had one drive out listening to the best stereo classic car album ever (Queen: A Night at the Opera) and it’s fab, but I am tempted to put a ‘front right’ speaker just to the right of the steering column on the right. So thanks again all.