Anomaly between my Lumin U1Mini and my DAC

S

skbe

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Hi there

I use Roon to play to my Lumin U1 Mini and via USB to my Sony TA H1ES headphone amp/DAC.
I set Roon to play at maximum PCM bitrate so Roon recognizes that my system can handle up to 32b 384k.
The anomaly is that the front panel of the Lumin shows PCM 384k 32b as expected but the front panel of my Sony which handles 32b signal shows an entry of 24b and then upsamples the signal to 32b.

So is it my DAC not recognizing 32b signal or is it Lumin not sending 32b signal to my DAC?
However if I set Roon to send 24b signal to the Lumin then the 2 displays both show 24b.

Your support would be helpful to understand this.
Thanks!
 

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Just to tell you to not worry with the black stripe on the Lumin front panel
My display is ok. But there is something with image refresh frequency of the display my phone could not handle perhaps
 
No audio resampling in the LUMIN. Everything done by Roon. LUMIN reads 32b 384k as sent by Roon. The question is does it transport what it receives to the dac?

Edit

Let me check after some tests. LUMIN resampling was set to off. But when I clicked custom, it appears that I previously set it as 24b. Now I set it again to Native and shut it again. I will see if by doing that there is a change

I just checked. Made bit depth handling as native then turned off resampling in Lumin. I have still the problem
 
Hi there
It seems the problem is coming from the Lumin or from my Lumin configuration.
I tried to connect my Sony Amp directly to my laptop and set Roon in the laptop to play at max bitrate. Then no problem the amp reads 32b as it is supposed to be.
 

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How is the U1 MINI and the TA-ZH1ES connected together? Coaxial or USB?

Please turn off Volume Control of U1 MINI in Lumin app settings.
 
Hi Peter
Do you think about something to correct this?
I mean there is no way for Lumin sending 32b and the DAC not recognizing it.
And as I said the DAC does recognize 32b signal when this one is sent from a laptop.
Many thanks
 
What is the source of the music file you are using to test? Are you sure the least significant 8 bits are not zeroes?

When using the laptop, was that done in exclusive mode with an ASIO driver, and bypassing the Windows mixer?

Our 32-bit playback was professionally tested by a corporate customer, so I know Lumin 32-bit playback is working with their chosen DACs.
 
Peter, hello.

Not sure this is related to the music but here is what happens.
I use Tidal, Qobuz, CD, HiRes, or any other stream. But what is important is that I use Roon for all the music. And I set up the DSP in Roon to upsample the music to 32b 384k. The display in the Lumin shows 32b 384k. But the display in the TA-ZH1ES shows entry signal of 24b 384k.

When I do the same thing with a PC using the WASAPI driver of Windows or the ASIO driver provided by Sony, I set the DSP in Roon to upsample to 32b 384k.
I hit play and then the display in the TA-ZH1ES shows entry signal of 32b 384k as it is supposed to do using exactly the same track and the same method ie Roon upsampling the signal to 32b 384k.

ASIO driver is in exclusive mode anytime in my configuration.
 
wklie said:
Our 32-bit playback was professionally tested by a corporate customer, so I know Lumin 32-bit playback is working with their chosen DACs.
Click to expand...

Not sure I understand
Your 32b playback was tested in a particular DAC. Good
But Lumin U1 Mini is a 32b player right? It is supposed to deliver 32b to ALL DACS that support 32b right?
You mean that there are some cases where the Lumin dont deliver 32b signal to DACs that support 32b?
 
Peter
When I listen to 32b 384k from Roon in my Lumin
And then when I go to sample rate customization in the Lumin app
When I switch between native and 24b, music don’t stop at all unlike if I switch between 16b and 24b
I keep on switching between 24b and native, and the display on the Lumin keeps displaying 32b
What’s the meaning of this?
Thanks for help

I will post a video of this in this forum and on Roon’s forum to try to get help also
 
Hi Peter
This thread was left unanswered
Can you please help me find a solution about this 32b output problem?
 
Please find a real 32bit music file (with non-zero least significant bits), and use Lumin app instead of Roon to play it. See what the DAC displays.
 
Do you by any chance have any link where I can find this?

And I am wondering how by any reason the signal path showed by Roon ie transferring 32b audio to the Lumin and the display showed by the Lumin ie 32b cannot be related to a real 32b stream?

And then why the same process done with my PC, ie Roon upsampling the file to 32b shows correct display in my DAC?

All of what I am saying is showed in the pictures above

This is something wrong with the LUMIN, I cannot find something else. But I am happy to do the test you mentioned if only you can do the test yourself and then send me back the file and do it also in my side
 
Proof that Lumin USB outputs 32 bit from Roon using RME ADI-2 Pro FS DAC native bit test:

By the way, Lumin supports USB DSD256 output to this DAC and several other RME DAC.
 

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wklie said:
Proof that Lumin USB outputs 32 bit from Roon using RME ADI-2 Pro FS DAC native bit test:

By the way, Lumin supports USB DSD256 output to this DAC and several other RME DAC.
Click to expand...

[emoji15]... Case closed [emoji51][emoji16]
 
nicoff said:
[emoji15]... Case closed [emoji51][emoji16]
Click to expand...

No the case is not closed

I see the picture Peter. That's fine. So maybe there is a solution.
I understand you did the same test than me ie upsampling to 32b with Roon. Let's call this the test.
How come when I do the test with my Lumin, my DAC understands only 24b, and when I do the same test with my PC, my DAC understands 32b?

By the way, when Roon is set to upsample to DSD256, the Lumin and the DAC show the same ie DSD 11,2Mhz so I have no problem with DSD.

The fact is I prefer for SQ consideration my DAC doing the upsampling to DSD rather than Roon. So my standard listening config is to set Roon with Max PCM bitrate and let the DAC do the rest
 
DAC-specific issue cannot be investigated without a DAC being accessible by us. Besides, if 24-bit works, then it's not a great problem as 32-bit is not offering any gains at the DAC. (32-bit is only useful as an intermediate step in signal processing.) According to Stereophile measurements, no existing DAC has higher than measured 22 bit resolution.
 
Thanks. Of course this thread is not about SQ matters. It is only for understanding why Lumin outputs 32b in some capable DACs and not 32b in other 32b capable DACs

If someone can do the test ie upsampling a flow into 32b using Roon and tell us what his DAC shows, that would be great to understand

In any case I know the Sony TA-H1ES DAC is 32b capable. It correctly shows 32b flow when it is sent by my PC. But it does not show 32b when the flow is handled by Lumin U1 Mini

And with no regards to SQ, I find that this a technical shame
 
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