Hifiman bluetooth shootout.

Here I compare Hifiman's Bluetooth open back Deva Pro, and closed back HeR9, using the Hifiman R2R Mini DAC, and using the Meta Quest3 VR headset. Also in this review, I will be comparing these headphones to the Hifiman He400se (wired open back), the Studio Wolf M6 5.1 (noise cancelling closed back) and Hifiman Edition XS.
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Many thanks. Paul