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#272024 - 2018-01-19 20:01 Bluesound Node 2 MQA works streamed to legacy 18 bit DSP5k!
Registered: 2016-10-31
Posts: 52
Nstzya Offline
Mostly harmless
Nstzya Offline
Mostly harmless

Registered: 2016-10-31
Posts: 52
Loc: Indianapolis, USA
I’ve been in the process of resurrecting some legacy 18 bit Gen 1 DSP5000’s (that I am ashamed to admit have heretofore been used as speaker stands for a variety of bookshelf trials - for which they do an excellent job BTW).

After being impressed with a Bluesound Powernode 2 streaming Tidal MQA driving the bookshelves, I got a Node 2 to try with the DSP5000.

As I understand the Node 2 - and MQA - although the Node 2 will fully unfold MQA given that it has an MQA DAC, if one as in my case taps the Digital Out (SPDIF coaxial) it will merely perform the first unfold and output 24/96 - which the 18 bit legacy DSPs should ignore. But I’m playing and enjoying MQA files (blue dot lit) on the DSP at the moment! How should this be possible?

-Scott


Bottom: DSP5000/18, 500.2, Bluesound Node 2 (MQA)
On Top: (of DSP5000/18) Martin Logan LX16, Velodyne Optimum 10, Bluesound Powernode 2 (Full MQA)
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#272025 - 2018-01-19 20:32 Re: Bluesound Node 2 MQA works streamed to legacy 18 bit DSP5k! [Re: Nstzya]
Registered: 2002-08-28
Posts: 4,268
Mr Meridian Offline
President of the Imperial Galactic Government
Mr Meridian Offline
President of the Imperial Galactic Government

Registered: 2002-08-28
Posts: 4,268
Loc: Perthshire, Scotland
Hi Scott

I believe there are a lot of MQA files around at 44kHz, in which case the older DSPs will be fine, as they can handle up to 48k. I think they also accept 24bit signals, but ignore the last couple of bits.

Cheers

George

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#272026 - 2018-01-19 20:40 Re: Bluesound Node 2 MQA works streamed to legacy 18 bit DSP5k! [Re: Mr Meridian]
Registered: 2016-10-31
Posts: 52
Nstzya Offline
Mostly harmless
Nstzya Offline
Mostly harmless

Registered: 2016-10-31
Posts: 52
Loc: Indianapolis, USA
Hi George,
I would generally agree with you except that in the Bluesound/MQA/Tidal milieu, when the blue dot lights it means it's a high res studio cut...


Bottom: DSP5000/18, 500.2, Bluesound Node 2 (MQA)
On Top: (of DSP5000/18) Martin Logan LX16, Velodyne Optimum 10, Bluesound Powernode 2 (Full MQA)
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#272027 - 2018-01-19 21:00 Re: Bluesound Node 2 MQA works streamed to legacy 18 bit DSP5k! [Re: Nstzya]
Registered: 2007-05-19
Posts: 978
JobSeeker Offline
Pan-dimensional being
JobSeeker Offline
Pan-dimensional being

Registered: 2007-05-19
Posts: 978
Loc: West Yorkshire, England
Don’t forget to specify in settings that the digital out is going to a non-MQA DAC. I can’t remember what the default setting is.


Marantz SR7011 AV Receiver + Bluesound Node 2
M218 + DSP3200
Laptop + Explorer 2
Roon (ROCK NUC)
CD ripping + NAS via Vortexbox
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#272041 - 2018-01-19 22:53 Re: Bluesound Node 2 MQA works streamed to legacy 18 bit DSP5k! [Re: JobSeeker]
Registered: 2016-10-31
Posts: 52
Nstzya Offline
Mostly harmless
Nstzya Offline
Mostly harmless

Registered: 2016-10-31
Posts: 52
Loc: Indianapolis, USA
I did. That’s why I’m dumbfounded.

I’m not arguing. And certainly enjoying bc it sounds great. But wondering what is going on digitally cuz it’s not supposed to...


Bottom: DSP5000/18, 500.2, Bluesound Node 2 (MQA)
On Top: (of DSP5000/18) Martin Logan LX16, Velodyne Optimum 10, Bluesound Powernode 2 (Full MQA)
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#272056 - 2018-01-20 06:51 Re: Bluesound Node 2 MQA works streamed to legacy 18 bit DSP5k! [Re: Nstzya]
Registered: 2004-08-07
Posts: 7,390
Ian Offline
President of the Imperial Galactic Government
Ian Offline
President of the Imperial Galactic Government

Registered: 2004-08-07
Posts: 7,390
Loc: Surrey, England, UK
Originally Posted By Nstzya
Hi George,
I would generally agree with you except that in the Bluesound/MQA/Tidal milieu, when the blue dot lights it means it's a high res studio cut...
Does the blue light mean hi-res or (as in Meridian MQA world) does it simply mean that it is "authenticated" (studio) irrespective of resolution?

In Meridian world you can have blue dot at any resolution, even 44.1/48k which would play on 18bit 5k's.


Meridian owner since 1992
DSP5000 96/24, MC200, Prime & PSU, Focal Elear, Explorer 1 & 2, F80, 200/203 and various Sonos.
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#272063 - 2018-01-20 09:23 Re: Bluesound Node 2 MQA works streamed to legacy 18 bit DSP5k! [Re: Nstzya]
Registered: 2007-05-19
Posts: 978
JobSeeker Offline
Pan-dimensional being
JobSeeker Offline
Pan-dimensional being

Registered: 2007-05-19
Posts: 978
Loc: West Yorkshire, England
If you're talking about the blue dot being lit on the Bluesound front panel, it has no significance regarding MQA - it merely means that you are hard wired to an Ethernet connection.. Only the app shows MQA indications.


Marantz SR7011 AV Receiver + Bluesound Node 2
M218 + DSP3200
Laptop + Explorer 2
Roon (ROCK NUC)
CD ripping + NAS via Vortexbox
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#272072 - 2018-01-20 10:50 Re: Bluesound Node 2 MQA works streamed to legacy 18 bit DSP5k! [Re: JobSeeker]
Registered: 2016-10-31
Posts: 52
Nstzya Offline
Mostly harmless
Nstzya Offline
Mostly harmless

Registered: 2016-10-31
Posts: 52
Loc: Indianapolis, USA
Haha, I’m a bit of a minnow in this shark pool of wisdom, but THAT would be funny! Yes, for those unfamiliar with Bluesound, there is a blue LED indicator light on the front of Bluesound devices, but I am talking about in the app itself, Jobseeker, lol! Adjacent to the MQA symbol itself.

I’ll need to delve further into the Bluesound materials, but as suggested, it must be the lower res MQA stuff or it simply wouldn’t/shouldn’t work. A few end of week beers and I came home to play with my new toy and got a little excited. Apologies.

It’s surprising then how much of the MQA catalogue is in this format bc I was able to play quite a few selections. Anyway, for those legacy 18 bit owners looking for something to feed and optimize their formally state of the art devices, it’s an interesting option...


Bottom: DSP5000/18, 500.2, Bluesound Node 2 (MQA)
On Top: (of DSP5000/18) Martin Logan LX16, Velodyne Optimum 10, Bluesound Powernode 2 (Full MQA)
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#272075 - 2018-01-20 12:03 Re: Bluesound Node 2 MQA works streamed to legacy 18 bit DSP5k! [Re: Nstzya]
Registered: 2009-10-13
Posts: 142
Fitcaz Online content
Hitchhiker
Fitcaz Online content
Hitchhiker

Registered: 2009-10-13
Posts: 142
Loc: SE England
The blue "light" is showing the source file is MQA quality and not the output.

As you indicate the stream on the digital output is not full MQA and is maximum 24/96 presumably your system strips 6 bits to get to 18 bit play back.


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#272077 - 2018-01-20 12:24 Re: Bluesound Node 2 MQA works streamed to legacy 18 bit DSP5k! [Re: Fitcaz]
Registered: 2002-08-28
Posts: 4,268
Mr Meridian Offline
President of the Imperial Galactic Government
Mr Meridian Offline
President of the Imperial Galactic Government

Registered: 2002-08-28
Posts: 4,268
Loc: Perthshire, Scotland
IIRC, the 18 bit DSPs' optimum input word length is 22 bits, which the output DACs reconstruct with 18 bit precision. So a 24 bit input will only lose the two least significant bits.

In my 518 days, you'd have the CD transport sending vanilla 16/44 which would be dithered to 22 bits for the speaker. The 518 was a brilliant piece of kit and really let the 18 bit DSP5000s bloom. The only downside was a slight softening of the bass, but a very worthwhile trade off. Anyway, going rather off topic now!

Cheers
George

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#272082 - 2018-01-20 13:04 Re: Bluesound Node 2 MQA works streamed to legacy 18 bit DSP5k! [Re: Mr Meridian]
Registered: 2004-08-07
Posts: 7,390
Ian Offline
President of the Imperial Galactic Government
Ian Offline
President of the Imperial Galactic Government

Registered: 2004-08-07
Posts: 7,390
Loc: Surrey, England, UK
18bit is really a bit of a misnomer with 5k's as SPDIF is min 24 bit so as George says, it’s more a case of what v1 5ks make use of rather than can accept.


Meridian owner since 1992
DSP5000 96/24, MC200, Prime & PSU, Focal Elear, Explorer 1 & 2, F80, 200/203 and various Sonos.
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#272084 - 2018-01-20 13:11 Re: Bluesound Node 2 MQA works streamed to legacy 18 bit DSP5k! [Re: Ian]
Registered: 2004-04-15
Posts: 12,270
VirusKiller Offline
Don't Panic
VirusKiller Offline
Don't Panic

Registered: 2004-04-15
Posts: 12,270
Loc: nr. Milton Keynes, UK
I'm quite curious as to what the Node 2 is outputting. The MQA file/stream decoded to MQA Core, then down-sampled? Or the un-decoded MQA file/stream?


Roon Developer and ex-moderator of this Forum
I am #25 in the HH1 photo of fame.
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