I experience poor audio quality with my Calisto 620/620-M when I use it to listen to music/media in Windows or Mac OS. What can I do?
This is a known issue with the Calisto 620 and 620-M.
Engineering has corrected the issue in a firmware update (USB firmware 470 and base firmware 02.00), which will be available via the Spokes Update Manager starting 3/22/13. Please note that the firmware update is for the speaker only - there is no update to the Bluetooth adapter.
To update your firmware,
After updating the firmware, the mute button will be active when you listen to music/media, enabling you to enable and disable mute. Plantronics recommends turning on mute when listening to music/media (mute is turned off by default). This will solve the issue. Note: It is not required to turn on mute when streaming music/multimedia from a mobile device.
This firmware also enables local mute with unsupported softphones.