Hello 1rocknroller,
Press the mode button repeatedly to select BASS, TREBLE, SUBW, BALANCE, FADER, DEFEAT, AND VOLUME. When subwoofer mode is set to off, it's level cannot be adjusted. If DEFEAT is set to ON, the player returns to factory defaults. Turn the volume control to adjust the setting. If no adjustment is made within 5 seconds after selecting, the player returns to normal mode.
Hope this helps.
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