My Jensen has an A/B/C button setup and the outside speakers are B.
However, my outside speakers sound terrible (I think they are wired out of phase).
It is going to the dealership Thursday to get that and a few other warranty issues fixed, plus will be winterized for the season!
Also, one of the inside speakers is blown, but I am going to replace them with a good pair of speakers as the ones that came in the trailer are just plain basic full range speakers and sound terrible anyway.
The Jensen is in the wall just to the right of the TV (notice Steve McGarrett aka Jack Lord, of the original 'Hawaii 5-0' show on the screen).