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We're here to help with your JBL PartyBox 1000. Please try using a different RCA cable and/or Aux cable to further isolate the issue. Try connecting from the RCA output of your PartyBox 1000 wired to the RCA input of the PartyBox 310 and vice versa or from the AUX output of your PartyBox 1000 wired to the AUX input of the PartyBox 310 then on the other way around. If you need more help, please contact JBL Customer Support.
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