
If anyone is having trouble transferring data from PC to Sony XM4, try 2 device connection in Sony's headphone app . I also deleted my original pairing, just in case, by holding the power and pairing buttons for more than 5 seconds, after that I uninstalled the BTA30 sound driver in Device Manager and rebooted. Use FooBar2000 for high bitrate input, but when streaming Spotify make sure it's selected for your PC and not another device like ROKU, otherwise there will be no sound. The DAC has a warm sound with crisp bass. small learning curve. The Support section of the FIIO website contains answers to frequently asked questions and other resources to help you. It's pretty easy.

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