Most likely the wrong cable is plugged into your dual zone adaptor. Dual-zone requires a stereo-instrument cable. A stereo-instrument cable will have two (2) black rings near the tip. This is called a TRS cable.
Most likely the wrong cable is plugged into your dual zone adaptor. Dual-zone requires a stereo-instrument cable. A stereo-instrument cable will have two (2) black rings near the tip. This is called a TRS cable.