Agree with Philipp_Schaefer
Sorry for my late reply. Thank you for the compliment! Your system looks amazing. The Lumin will be a great addition.
To your questions: The Sbooster is for the Matrix Audio SPDIF-2 (that mysterious small black box on the left) that takes the Lumin USB signal and converts it to I2S which is delivered to the PS Audio DSD via HDMI. It can be powered by USB but I prefer the sound with the Sbooster LPS.
The EtherRegen was a nice addition. At least thatâs what my brain wants me to believe. I usually listen to my brain, so it stays in the system 
It is powered by the SPS provided by Uptone Audio. No funds for a LPS at the momentâŚ
I have not used the ISO Regen, so I canât tell you anything about it, sorry.
Thanks for the answers and tips Philipp.
Yes, sounds logical what you recommend for MQA, Iâll do the decoding on the Nucleus.
I was planning to disable just about everything on the Lumin anyway since I only use Roon.
Just not sure about enabling some of the upsampling options though.
@StringsForever, are you using the 120V NA version of Luxman P750u or a JP version w/ step-up?
When using Roon, please leave the Lumin internal upsampling disabled. You only need to think about whether you need Spotify Connect and AirPlay (âLumin Streamingâ).
Clear, thanks Peter! I think Iâm getting the picture, use the Lumin as a pure bridge.
I donât need Airplay or other options, just Roon.
Are both USB outputs the same by the way is is one dedicated for DAC and the other for drives?
@jfx 220V, Iâm in Europe.
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Both USB ports are the same. Use just one for DAC. The other should be left unconnected.
Noted, donât need to connect storage anyway.
The U1 Mini should come in early next week.
Just reporting back here after installing the Lumin U1 Mini. Setup through the app was very easy and everything worked flawless. Installed the latest firmware update.
- The Luxman DA-06 works fine with both DSD and PCM. The Schiit Bifrost 2 works fine as well. MQA I decode with the Nucleus, works great. I think I have about all options turned off in the Lumin to prioritize SQ.
- SQ: havenât had the time to do a good listening session yet as I only finished installing it a few hours ago but what I can notice right away is better clarity and detail than connected straight through the Nucleus. Havenât been able to seriously compare USB vs. AES yet.
- Connectivity: much more options than I hoped for when reading the forum and actually works the way I wished but didnât think was possible. I have the Luxman connected via USB1 and AES, the Schiit connected via USB2 and Coax. When the Luxman is turned off I can use the Schiit via USB and Coax. When the Luxman is turned on I can use the Luxman via USB and AES plus the Schiit via Coax. It doesnât matter if the Schiit is turned on or off, the Luxman takes precedence. Really, really awesome!
Just one question if I may: I let the Nucleus decode MQA and have no DAC that can render MQA. What is the difference then between setting the MQA mode in the Lumin on âOffâ vs. âPasstrhroughâ? Both seem to work the same.
Anyway, really nice device and very happy with my purchase!
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Generally, when the USB output is connected, the other outputs no longer have correct timing - unless the DAC also turns off its USB input circuit (behaves as disconnect) when switched to other AES or coaxial input.
Go into Lumin About function of U1 MINI, and see if USB DAC information is listed. It shows up if a USB DAC is detected, it is absent if USB DAC is not detected.
With Passthrough, signal still goes through the MQA authentication so Lumin can still display MQA authentication. âOffâ therefore requires much less processing.
Great! We never received any report of using Unison, so I did not know itâd work.
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The Schiit Unison stays on permanently so Iâll pull out that USB cable then.
The Luxman USB deactivates when turned off but not when switching inputs on the DAC so Iâll try out USB and AES to see which I like best. Iâll give it some burn-in time.
I set MQA to off now.
Is there any use to let the U1 go through the MQA Authentication when the Nucleus does the decoding and the Luxman doesnât render?
For display purpose only, if you care about MQA authentication. This may be helpful when occasionally you think youâre streaming Tidal MQA, but Tidal delivers you a 16/44.1 version instead of the MQA version you expected. (This can also be checked indirectly without MQA authentication in Lumin, since MQA Core decoding from Roon must result in either 88.2kHz or 96kHz.) Roon has already done the authentication already, but youâll need to bring up the signal path to check.
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Tried it, I see. I just put it off. The only thing I have turned on is Roon.
Burning in for a few days, will try to report back about SQ but itâll be hard to compare to Nucleus direct out.
For now even though it is more detailed and clear in my opinion I donât hear sharpness, seems smooth overall just like the Luxman DAC.
Generally, when the USB output is connected, the other outputs no longer have correct timing.
How can I notice if the timing is wrong when using AES? The Luxman USB doesnât turn off when switching inputs on it.
There could be dropout on AES / BNC / coaxial / toslink if USB DAC is connected (and therefore USB is the primary output), after playing for a long time.
Without USB connected, all four AES / BNC / coaxial / toslink can be used simultaneously.
Thanks Peter!
That happened once, indeed after a long period of playing.
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My U1 Mini will be on its way in a couple of days.
Mr Dave and Mrs Utopia are waiting for itâŚ
I am also curious to compare the USB and toslink connections with the Dave.
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Iâm interested in your comparison results, after burning in the U1 MINI for a few days.
Sure, I will share. Burn-in my brain maybe⌠(another dangerous topic to talk about in an audio forum!)
My Lumin U1 Mini arrived today.
Hooking up was a breeze. Roon immediately recognized the U1 and the Dave and automatically set them up.
One note to @wklie: differently from what I read in other posts the USB and OPT out are working simultaneously up to 96KHz.
At 192Hz the OPT out doesnât seem to work anymore with DAVE.
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With USB connected, it becomes the primary output, and all the other outputs no longer have correct timing.
192kHz OPT needs to work - please disconnect the USB. If it still does not, power cycle both the Lumin and your DAVE. Try a different optical cable. Re-verify your DAVE works at 192kHz from optical using another source (e.g. PC).
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