Sorry if this is a dumb question, but thought I read before for MQA to work properly does that mean I have to turn of Roon Convolution (I use the HAF Filters), and also Sample Rate Conversion?
Thanks - sort of what I was afraid of - when you get to the subjective lets use our ears to evaluate a technology such as a lossy format you lose any scientific basis. The industry spent many years developing MP3 lossy compression to the point where they felt peoples ears ācouldnātā hear the difference. Clearly for a large part of the audience they were correct. The more I learn about MQA it looks like this is more of the same - but applied at what is supposed to be a much higher quality level. Keeping its technology hidden and not letting the public industry fully test it and evaluate it does not play well with me. They are having success by having their technology being supported by manufacturers but it is unclear if this is because it is actually better or simply an advantage re: sales and marketing. Clearly it is not a lossless bit perfect format.
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Itās not a dumb question at all. And you are correct. For the MQA light to go on in an MQA DAC there canāt be any intervening non-MQA DSP.
Whether MQA would permit first unfolding in software to be then followed by non-MQA DSP has been a big issue for many Roon users.
As yet, no official announcement has been made by Roon beyond the fact that MQA is coming to Roon. The recent MQA announcement doesnāt add anything to that.
Itās been an extraordinarily long journey for all Roon users who are interested in MQA, and, at times, I lost confidence that anything would actually happen. Iām now confident that Roon and MQA are going to happen and that we will be pleased with the implementation.
Iād say that the large part of that audience didnāt care. When Iām at work listening to the radio, I donāt really care either. When at home howeverā¦ and my friends who donāt care about listening to MP3, they do say they hear the difference and that it sounds almost live when I turn something on for them at my place. But after that, they still donāt care 
Iām sure there will also be people who donāt want lossy, no matter what it sounds like.
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Ha, it sounds like we have the same friends.
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Andybob
Appreciate the quick reply.
Assume Roon will implement some sort of check or switch that would automatically turn off Convolution if it found an MQA file and stream it pure (or whatever MQA is), but revert to the filters when non-MQA. Realise this assumption is unknown, but would seem to make sense, as then itās either MQA or Convolution, but not both during listening sessions.
Thanks
John
i would think turning convolution off for MQA would be more detrimental to a persons system than the perceived value added of full MQA decoding.
Ultimately a full software decode prior to convoluton would be the cats meow.
Brian has confirmed that Roon will be doing first unfold:
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If you have read Stereophile part 2 review, you can see MQA doesnāt follow very much to a Hi-Res recording (DXD), in fact it is somewhat 20dB more noise overall from 10kHz to 30kHz, these noise is quite significant because it happens in the audio range.
In a separate discussion on Aurender A10 streamer, due to MQA āleakyā filter, aliasing got reflected back to the audio range causing distortion.
All these abnormalities doesnāt look good at all for so called MQA āHi-Resā. These are inherent limitations of the format which doesnāt solve anything but creates its set of own problems.
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I dont understand the science but MQA (through Audirvana) sounds incredible in my system. I prefer it actually. I am looking forward to Roon releasing a decoder.
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Thanks for confirming that, so it looks like Roon will follow Audirvana and Tidal desktop app, doing the first unfold, hopefully thereās an option to up-sample it with some filters to reflect the original recordingās sampling rate especially those beyond 88.2/96k.
A filter for upsampling that cleans up things similar to what Jussi has done with his specific MQA filter.
Exactly, thatās what Iām hoping for, otherwise people will start asking why Roon indicates the final unfold sampling frequency but only unfold to 88.2/96k.
I wonder how this will work with what Auralic Does with MQA.
Iāve an Aries Mini which Iām using as endpoint together with Roon. Though it can do MQA using their method, Iāve compared both Auralic and Mytek Brooklyn DAC; in many listening sessions I and my colleagues couldnāt find the difference. I would like to see in a technical measurements whether thereās an extended frequency response beyond the 20kHz to 48kHz and an optimised impulse response.
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Jeff
Yes, will keep running with my HAF filters and see what transpires. Full MQA software decode, then convolution would be ducks nuts.
Of topic, just need Devialet to get their act together and make RAAT compatible and all pieces coming into place with my set-up (realise you got out of Devialet, but Iāve got a 1000Pro, so still hanging in there with them, frustrating as they are).
Well I got rid of mine nearly a year ago now. I wasnāt as frustrated as everyone is right now, I used USB for my insanity in the end.
I could see I would really be a Devialet hater on the good old devialetchat forums if I still had one. Iād be accusing āConfusedā of sniffing glue for his optimism. Ah the good old days. 
How do you unfold MQA in an iOS when the built-in DACs for iPhone and iPad are limited to 48kHz?
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If you attach a Dragonfly DAC to an iOS device you can go higher.