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– ‘MASTER’ quality setting – Track streamed in MQA. Tidal client or your DAC can do the unfolding depending on setup. MQA is not lossless.
– ‘HiFi’ quality setting – Track streamed in what was claimed to be ‘lossless’, but it was actually seemingly just the MQA version without any MQA flagging or metadata, so it would not be unfolded. And is also not lossless.
– ‘High/Normal’ – Track streamed in compressed format.
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To be exact, it's not that simple, especially for the second point.
On the first point, there are mainly 24bit MQA (in 44.1 and 48kHz, that once decoded to 24/88.2 or 24/96 will be rendered/upsampling), BUT there are also some 16bit MQA when they didn't get a master at 24bit, and some album are only available at 16bit MQA.
So when you see "Master", it only means that it's an MQA file, and that it will be at least decoded, by the app or by your MQA DAC (and rendered if you have a MQA DAC), but it doesn't mean it's a 24bit MQA for sure.
On the second point, it may end like that, but until now, it's only in few cases.
It's hard to count, but I would say at least half the tracks are still in real 16/44.1 FLAC in the Hifi category. And almost the other half is 16bit MQA. These last ones started more than one year ago.
And now, since the MQA debat/change of main owner/new pricing, it seems some tracks/album have only 24bit MQA and 360/Atmos, and that if your are on Hifi sub, it will be reduced to 16/44.1
So the second point can't be generalized like that, there are at least three different cases. Now, it would be simpler to have one case only.
They also need to fix the ads saying Hifi is lossless at 1.411Mbps, and Hifi Plus up to 9Mbps, because it's wrong. All real FLAC and 16bit MQA are mainly lower than 1Mbps, and mainly all 24bit MQA are lower than 2Mbps