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Hi Ray, The sound intensity difference between Bluetooth and the optical connection on your ULT TOWER 9 is typically due to the settings of the connected source device (like a TV). To achieve the same powerful volume as Bluetooth, navigate to your source device's audio output settings. Ensure the Digital Audio Output Volume is set to Max/Fixed instead of Variable, and confirm that the audio output format is set to PCM or Stereo. These adjustments on the source will ensure the speaker receives the strongest possible signal. Thanks for choosing Sony. Best regards, Eliab
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