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[petrik]

Actually, these two modes are briefly explained also on Devialet's website.
https://www.devialet.com/en-eu/expert-pr...ing-audio/

AIR offers two different set-up options, asynchronous BitPerfect or asynchronous fixed broadband, to ensure the best possible service quality in even the most unreliable network environments. Asynchronous BitPerfect mode provides optimal audiophile-grade conditions: music is transferred from your computer or smartphone to the amplifier with zero alteration to audio samples. This mode of transfer occurs at the exact same rate as Expert Pro digital-analog conversion rather than the speed imposed by your computer. The amplifier therefore dictates computer behavior rather than the opposite, with AIR intelligence split evenly between the two devices.