“When I have my 2 jbl 300 connected via RCA cable, I can only control the volume through the paired device on one of the speakers. Is there something that I am not doing right to be able to control the volume on both of them using the paired device?”

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• This is normal. The output level on the RCA is fixed that's why the volume of the second PartyBox 300 doesn't change. You could utilize the TWS feature by pressing and holding the Bluetooth button on each speaker for 5 seconds at the same time.

  Answered by JBL Support 5 years ago

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