[JRTJH]

AlbertaRvMan,

If your RV is wired with three sets of speakers, they are probably wired like this:

A = Inside front AND rear speakers

B = Not used

C = Outside speakers

To control the volume of your speakers, turn up the volume knob (obvious)
To control the balance, use your LEFT/RIGHT balance
To control the Volume of the FRONT/REAR, use your FADE control. It's wired like the speakers in your car. Balance is L/R and Fade is F/R.

Hope this helps.