“Is there some sort of button code or sequence that can enhance the bass or any kind of sound on my JBL partybox 310?”

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• One press is low. Second press is high. Third press will turn it back off

  Answered by MikoKL 2 years ago

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• Our JBL Partybox 310 has the BASS BOOST button to enhance the bass level: level 1, level 2, or off.It is located at the control panel of the speaker.

  Answered by JBL Support 2 years ago

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