Playing DSD 256 over Lumin U2X

Support
1

Dear All,

I have recently installed a Roon Server over my Mac Studio Ultra M3.

During a recent stay in Hong Kong, I bought a Lumin U2X.

The Lumin is connected to my Lyngdorf MP60 through an optic cable.

To test my new set up I bought a DSD 256 version of Beethoven Symphony 6.

Unfortunately I am unable to hear any sound.

What am I making wrong ?

2

Are you sure your Lyngdorf is capable of decoding DSD? I cannot see that in the specifications.

Also, an optical connection (I assume you mean Toslink) isn’t suitable for DSD.

Edit: could you try to downsample to 96 kHz?

3

The fastest you can get over a regular optical connection is DSD64 via DOP assuming Lumin allows it. Check the specification for both ends and follow what they say.

4

Lyngdorf, as a surround processor, cannot play DSD natively without conversion to PCM.

In Roon, please turn on resampling to set DSD conversion to 96kHz.

(Only if you’re not using Roon, then in Lumin app, turn on Audio Resampling for all DSD to 88.2kHz.)

If you wish to play DSD256 natively without conversion, you need a Linux native DSD compatible stereo DAC that does that, and a stereo amp that is not a surround processor.

5

Hey @Serge_Kouthon,

This looks like a compatibility issue between the transport path and the format you are trying to send. A few things stand out: the Lyngdorf MP60 does not natively decode DSD, and optical/Toslink is not a path you can use for native DSD256 playback.

Please try this in Roon: open the audio zone for the Lumin U2X, go to its Device Setup, and set DSD Processing or resampling so DSD is converted to PCM at 96 kHz before it reaches the Lyngdorf. That should let the MP60 receive a format it can actually play.

6

Hi @Serge_Kouthon,

We wanted to reach out to ensure you saw the response above. If you have a chance to perform the request test, we’ll be able to expedite troubleshooting by looking into logs.

Please share the name of the track you attempted to play and we’ll pinpoint the event. Thank you!

7

Thanks @noris and @Peter Lie, I will try that today. The way I see it (and Ideally) : in the long term and if Lyngdorf allow me to switch to an external DAC , I should acquire an external DAC able to decode DSD 512 such as Soulnote Audio: Soulnote D-1N DAC and then try to plug the external DAC into my Lyngdorf and use the Lyngdorf ass a passthrough PRE AMP. If feasible, this would deactivate the RoomPerfect feature for sure but leave the original source signal unchanged.

8

I will try that today. The way I see it (and Ideally) : in the long term and if Lyngdorf allow me to switch to an external DAC , I should acquire an external DAC able to decode DSD 512 such as Soulnote Audio: Soulnote D-1N DAC and then try to plug the external DAC into my Lyngdorf and use the Lyngdorf ass a passthrough PRE AMP. If feasible, this would deactivate the RoomPerfect feature for sure but leave the original source signal unchanged.

9

Just realized:

  1. Roon is using an AirPlay connection (as opposed to Ethernet) to connect to my Lumin
  2. Roon automatically downplay my DSD 256 file to 44khz as opposed to letting Lumin handle the conversion

IMG_9929
IMG_99291179×2556 269 KB

Wonder how to change that

10

Look in Roon’s :gear: > Audio - I suspect the Lumin U2X has two entries: one for AirPlay and one for Roon Ready…

11

In Lumin app, please turn off AirPlay. Turn on Roon Ready.

In Roon settings → audio, scroll down to Roon Ready section, find Lumin, enable it and assign it a zone name. Play to this zone.

After you get this working, setup Roon DSP Engine to resample all DSD rates to 96kHz.

12

Thanks, Here is what I did :

1C684A7B-8A85-44B5-B24F-A709203A7FD9_4_5005_c
1C684A7B-8A85-44B5-B24F-A709203A7FD9_4_5005_c359×780 46.6 KB

404C1F33-0B35-4381-8041-67E49A124C97_4_5005_c
404C1F33-0B35-4381-8041-67E49A124C97_4_5005_c359×780 49.3 KB

Here is the result :

F05F2D88-DED5-4A76-85A0-034F1E4BBDF4_4_5005_c
F05F2D88-DED5-4A76-85A0-034F1E4BBDF4_4_5005_c359×780 35.3 KB

Miuch better :slight_smile: , although I sill don’t understand :

  • why did the sample rate conversion downgraded from 11.290 Mhz to 2.822 Mhz (despite my ethernet connection and my Mac Studio M3 Ultra power) ?
  • why where the channel downgraded to 2.0
  • why did the sigma - delta modulator switch to DSD 64

What I do know is that my Lyngdorf probably took the 176.4 Khz signal and automatically downgraded it.

13

A. No, this is not what I asked you to configure. In your current setup you’re doing more times of audio resampling than necessary.

  1. You need to do this with Roon DSP Engine via Roon interface from a computer or tablet, not Lumin app. In Lumin app, please turn off re-sampling.
  2. You must not use a target sample higher than 96kHz. If you resample to 176.4kHz, Lyngdorf will need to downsample it another time, so there will be further degradation to music signal

B. Lumin product is stereo only.

C. see A

14

Hello @Serge_Kouthon, welcome to the community!

Peter from LUMIN has provided the correct guidance here. To summarize: configure resampling via Roon’s DSP Engine rather than the Lumin app, keep the target sample rate at 96kHz or below to avoid double resampling by the Lyngdorf, and note that the 5.1 → stereo downmix is expected since the Lumin U2X is a stereo device. Please follow Peter’s instructions and let us know if you have any further questions.