The way most are wired (or should be) is as a second pair of speakers. In a car, they would be called front or rear. Balance is for left/right mix, while FADE controls front/rear mix. You might have to fiddle with the controls on the radio, but the menu will take you through balance, bass, treble, and FADE. Use fade for inside, outside, or both.
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Marty and Martha
2015 Z-1 211RD
2012 Nissan Titan
Dalzell SC
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