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#248963 - 2016-04-10 13:58 Re: Multichannel MQA [Re: Kal Rubinson]
Registered: 2016-04-01
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ThomasSA Offline
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Loc: Oslo, Norway
My thinking are that MQA is a kind of Direct extreme...
If you add any DSP processing then it will change the bit information.
I hope they allow us to use Trifield with MQA sources and still keep the resolution even if its not MQA anymore.

Also hope that will be true for Legacy systems, you should at least be able to extract 24/96 and pass it over MHR to the speakers.


861v6, 800v3, HD621, DSP6000, DSP5500.2HC, DSP5500, DSP3100 all 24/96, C15, AC12.
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#248964 - 2016-04-10 14:01 Re: Multichannel MQA [Re: ThomasSA]
Registered: 2004-04-15
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VirusKiller Offline
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Registered: 2004-04-15
Posts: 12,325
Loc: nr. Milton Keynes, UK
Originally Posted By ThomasSA
Also hope that will be true for Legacy systems, you should at least be able to extract 24/96 and pass it over MHR to the speakers.
That's already possible. My 818v3 feeds, among other things, my 861v4 and a 5-channel system; MRC is critical, but I do always listen in Direct...


Roon Developer and ex-moderator of this Forum
I am #25 in the HH1 photo of fame.
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#248965 - 2016-04-10 14:06 Re: Multichannel MQA [Re: VirusKiller]
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ThomasSA Offline
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So what you're saying is that if lets say C15 can extract MQA to 24/96 it will pass this on to 861 as a MHR stream?


861v6, 800v3, HD621, DSP6000, DSP5500.2HC, DSP5500, DSP3100 all 24/96, C15, AC12.
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#248967 - 2016-04-10 14:27 Re: Multichannel MQA [Re: ThomasSA]
Registered: 2004-04-15
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VirusKiller Offline
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From what I've understood so far, in a Sooloos system, the MQA-decoded stream has to end up at a Meridian DAC, because this is the only type of DAC that a Meridian MQA decoder can "profile" for.

This means that the digital path must either be MHR-encrypted all the way, or there needs to be a mechanism in the Sooloos streaming protocol which tells the 861 that it cannot output unencrypted digital (because this could then be used with a non-Meridian DAC for which the decoded MQA was not profiled...).

It's possible that the C15 might do a software decode and send the resulting 96/24 or 88/24 decoded MQA to an ID40 or ID41 (with the proviso that the 861 keeps it encrypted). In a legacy system, this is better than un-decoded MQA, but not optimal, because, with the ID40 and ID41 cards limited to 96/24, the (usually 192k-capable) Meridian DACs won't be driven optimally. However, that's exactly what I believe is happening in my situation: my 818v3 decodes the MQA and outputs 2x rate MHR to my 861v4, which can then process it and pass it on to my DSP loudspeakers as 2x rate MHR.

To the best of my knowledge, the C15 will not do MHR over SpeakerLink or coax, nor could the C15 stream to an MS200 or MS600, because neither (again, to the best of my knowledge) can do MHR on the digital output; the digital outputs of the C15 and MSx00 are unencrypted.

Still lots of unknowns; hopefully they will soon become clear.


Roon Developer and ex-moderator of this Forum
I am #25 in the HH1 photo of fame.
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#248975 - 2016-04-10 17:13 Re: Multichannel MQA [Re: VirusKiller]
Registered: 2010-01-24
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Altus Offline
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Registered: 2010-01-24
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Loc: Midlands, UK
VK

I thought that the 818v3 would only provide undecoded MQA (upsampled x 2) to your 6ks? You seem to be saying that even with non SE speakers the first degree unfolding is taking place? (the 861 being a neutral intermediate step).


Streaming: Roon, NUC, QNAP869 NAS
2ch system: Ultra DAC, analogue amps and speakers
Retro system: 101/104/105, analogue speakers
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#248978 - 2016-04-10 17:36 Re: Multichannel MQA [Re: Altus]
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Loc: nr. Milton Keynes, UK
Correct. I was assured by John Buchanan that the 818v3 does the very best it can for all downstream devices. Plus architecturally, I believe that this has to be the case: the MQA decoder is on the digital input card and the 818v3 will produce output for the analogue, coax, and SpeakerLink outputs simultaneously. I cannot see that it's potentially "triple processing" for different capabilities on different outputs!

Important edit: I believe that the 818v3 *is* triple processing at the output stage, but not at the input stage! In other words, the 818v3 gets the very best it possibly can from the input, then does what it can on the outputs.


Roon Developer and ex-moderator of this Forum
I am #25 in the HH1 photo of fame.
Edited by VirusKiller; 2016-04-10 18:25.
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#249968 - 2016-05-11 10:56 Re: Multichannel MQA [Re: VirusKiller]
Registered: 2004-01-12
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Crion Offline
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Registered: 2004-01-12
Posts: 2,290
Loc: Stockholm, Sweden





The new 2L Trondheimsolistene REFLECTIONS album was recorded in discrete 12.1 ch DXD. Would be awesome to hear in Multichannel MQA on the next 861v9! smile


Future 861 MQA/24-192 system upgrade owner!
DSP8000SE, DSP7200SEHC, DSP5200SE sides, DSP7200SE rears, 861v8/ID41, MC200, Sim2 HT380 T2 1080P, Stewart Cinecurve 2.35:1, XEIT CM-5E Anamorphic lens, Apple-TV 4K with nFuse 5, HDI Dune BD Prime 3.0 with Wireworld Platinum HDMI -> UHD722 -> Audioquest Diamond RJ45. Shunyata Sigma Digital@861v8.
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#263123 - 2017-04-16 14:46 Re: Multichannel MQA [Re: Crion]
Registered: 2011-01-25
Posts: 474
bxd Offline
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Registered: 2011-01-25
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Hi,

In the May 2017 issue of Stereophile, Kal (in his "Music in the Round" item) has a play with multi channel MQA playback.

Brian


Main: G65, MD600, MS600, 218, HD621, DSP5200SE, DSP5200HCSE, M6 & D1500.
System 2: G91A, MS200, DSP5000 (96/24v1), DSP3300.
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#263190 - 2017-04-18 02:32 Re: Multichannel MQA [Re: bxd]
Registered: 2007-07-09
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JimK Offline
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In a letter from Bob Stuart commenting on multichannel MQA, there is this unequivocal statement about our near future:
Quote:
Finally it has always been possible to perform EQ and other DSP in an MQA decode - that is fundamental to implementation in an AV receiver or a DSP loudspeaker. This facility has not yet been implemented in PC applications, but it might come this year.
Very promising and it sets expectations for Meridian, both two and multi channel.


Roon, 818v3, Swallow Acoustics ALS2 active analog speakers, Technics SL10 turntable, and a modded Oppo 83.
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#264794 - 2017-05-29 12:02 Re: Multichannel MQA [Re: JimK]
Registered: 2004-01-12
Posts: 2,290
Crion Offline
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Crion Offline
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Registered: 2004-01-12
Posts: 2,290
Loc: Stockholm, Sweden
Interesting, thanks!

Both Kal having a play with MCH MQA and the DSP part of an A/V processor/DSP loudspeaker.

Where was this 'letter' from Bob, Jim?


Future 861 MQA/24-192 system upgrade owner!
DSP8000SE, DSP7200SEHC, DSP5200SE sides, DSP7200SE rears, 861v8/ID41, MC200, Sim2 HT380 T2 1080P, Stewart Cinecurve 2.35:1, XEIT CM-5E Anamorphic lens, Apple-TV 4K with nFuse 5, HDI Dune BD Prime 3.0 with Wireworld Platinum HDMI -> UHD722 -> Audioquest Diamond RJ45. Shunyata Sigma Digital@861v8.
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#264811 - 2017-05-29 16:24 Re: Multichannel MQA [Re: Crion]
Registered: 2011-01-25
Posts: 474
bxd Offline
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bxd Offline
Paranoid android

Registered: 2011-01-25
Posts: 474
Loc: Southampton, UK
Hi,

Letter from Bob was in the 'Manufacturers (feedback) Comments' in the same issue.

Brian


Main: G65, MD600, MS600, 218, HD621, DSP5200SE, DSP5200HCSE, M6 & D1500.
System 2: G91A, MS200, DSP5000 (96/24v1), DSP3300.
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