Our Vibe has the BOSS system. The manual shows using the fader (front to rear) to select inside or outside. Problem is, the inner and outer speakers on our unit share the same cabinet/box. Due to the acoustic coupling (ever see home stereo speakers with "passive woofers?") the unselected speakers always produce some sound-the pressure waves from the powered speakers move the speaker cones of the unpowered speakers. The higher the volume, the less difference between the inner and outer sound output. Even if a cutout switch is installed, if they share the same box, it will not make much difference.
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