But it did unfold he's other mqa files...
Maybe the file name path isnt mqa at end?
Like .flac / .wav / .mp3 ?
There has to be a mismatch of something the dap is being picky?
-- Summary --
Thank you for the replies. You were right, its just the DAP being picky (but kind of in a good way) about the tags. Its not the naming convention, its the metadata within the file.
I'm putting this all up here in case someone with the same issue comes across this.
After some digging it appears there is either an error in the tagging of this MQA album or its being miss-sold and the MQA process that prevents shops from altering a file to 'up-sample to sell' is working.
In this instance I believe that the file has been miss tagged by accident and I've contacted the online store I've purchased it from to see if I can get this resolved. I'll update if they respond.
-- Detail --
So it appears that Sony Walkmans MQA system is very reliant on the Tagging of a file, MQA files have a tag stating what its original sample rate is. This and other data is protected in the file from any tampering (probably by a hash key, but I'm not entirely sure) which is one of the 'selling' points of MQA over FLAC. Other MQA players (my friend has a few and he has tested the album on it) initially play the file as FLAC and then detect its a MQA and the DAC switches to 96kHz sampling playback, but DACs don't read the tags (from what I understand), but DAPs need to which enables the album/artist view etc.
While it might seem straight forward changing this to 96kHz, this completely removes the MQ
A. The file detects its been tampered with and is no longer recognised as an MQA; its lost its
Authentication.
I did change the original sample rate tag and my walkman as well as Audivarna no longer recognised the file as an MQA, just a regular FLAC file. Fortunately I tested it on a copy vs my original download.
My other MQA files all have the correct tag for 'Original Sample Rate' and are therefore unpacked correctly by the Walkman.
Sony might be able to patch this reliance on metadata tags, but its not really their fault. The file should have been tagged correctly. Or, as I said before hand, this album is being miss-sold.
Also as promised, here is the spectrum-analysis read out of the MQA files;
N.B. this is recorded on a Focurite 8i6 ports 1+2 via a cable from the walkmans 3.5mm headphone port. Min/Max amps altered just to make it visually obvious at glance.
There is quite a clear cut off at 20kHz on the Pink Floyds album vs the Mozart one that goes up to 88kHz (and probably above, I was sampling at 196kHz 32bit).
So: The walkman is correctly reading the Pink Floyd as an MQA, but only at 44.1kHz. So I'm still getting the other benefits of MQA, Higher transient response, A to D and D to A profiling and lower digital distortion etc etc... Just not the high frequency spectrum.
If I hear back from the store I bought the Pink Floyd album from, or find anything changes, I will post an update.