How do I use a microphone or guitar with the PartyBox 1000?
Connect your microphone or guitar to the MIC or GUITAR jack on the back panel of the speaker. Rotate the MIC/GUITAR volume knob to adjust the volume to your desired level, and use the main volume buttons to adjust the audio source volume separately. When not in use, decrease the MIC/GUITAR volume to minimum and remove the cable from the jack. (Pages 11-12)
From the official Jbl Jbl Partybox 1000 Owners manual, page 11
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