Lumin D2... Could it be a perceivable upgrade in sound quality?

I’d also be interested to hear feedback on this, but my gut feeling is that Lumin are pretty happy with their SMPS, given that it has just also rolled out to the T2 (I am assuming, perhaps incorrectly, that it’s the same spec and configured similarly). Maybe I’m not sufficiently cynical, but I don’t think they would be content if it didn’t deliver very good performance.


The SMPS inside D2, T2 and U1 MINI is indeed the same.

1 Like

Lumin may be happy, and I am absolutely loving my stock D2. However, if an LOS can improve sound quality (as it did with the D1 which admittedly had a wall-wart), I am game to try it within reason.

I did place an order for one, which is about $450 shipped within the states. It includes a D2 connection kit, which looks like you just disconnect the stock PS from the motherboard, plug in the connector kit, and connect the cable from the Sbooster. So listening tests should be easy as there is no surgery needing to be done.

If the PS is the same from the D2 to the T2, then all the better as it might ease my path to a T2 if inclined. I will report back once I’ve received and played with the LPS.

So this could be a new topic, or elsewhere, since we already discussed things here, I will just continue here.

Everything up and running with ROON and my Lumin D2, but I have a few questions. First being the upsampling or not. There is a bunch of Lumin possible options for upsampling to higher PCM or to DSD. Roon also offers at least one version to upsample all to DSD, Confused a little here which to use, and what happens if you have both on ? What is better to use and why if you can ? Or I believe thru Lumin you can just upsample PCM to higher PCM ?

But again just wondering the best way, for this group of settings to start and then also what happens if the setting are on both products simultaneously by mistake ?



No doubt @wklie will step in to answer here but I think the general recommendation is to let Roon do the work, both because the algorithms are likely to be more sophisticated (as greater processing power is available) and because it separates out any noise associated with the processing overhead from the sensitive DAC.

I asked Peter a similar question in relation to my A1. Both the A1 and the D2 share the same Wolfson DAC’s in common.
This is what Peter has to say on the matter:

Roon philosophy is to move processing to Roon Core, so typically you can disable Lumin internal re-sampling. You can try having Roon send bit perfect audio to Lumin or use Roon DSP to upsample to DSD64 and see which you like more.

Lumin internal re-sampling: It depends on the sample rate of the input signal, which is not necessarily the same as the sample rate of the music file when you use Roon DSP.

  • If you use Roon to upsample 44.1kHz to DSD, then setting Lumin upsampling of 44.1kHz to anything has no effect because the input signal is DSD, not 44.1kHz.
  • On the other hand, if you use Roon to upsample 44.1kHz to 88.2kHz, and have Lumin internal upsample from 88.2kHz to DSD, then you’re doing two upsampling steps: first in Roon Core, the second inside Lumin. This is possible but usually not desirable.

I realized I duplicated the upsampling, and it seems there is some funkiness to the sound, I will get back into it and make sure I just use ROON. Speaking of ROON, what about Sigma Delta Modulator ?

If your Roon Core processing speed with DSD upsampling as reported in the signal path is not above 2.0, enable Parallelize Sigma Delta Modulator.

I have Roon doing the processing and using the Nucleus, I am not seeing processing speeds drop below 2.6 unless I am also using the Audeze filters. Only when processing high bit rate files does it slow down a bit. My ears tell me that letting Roon own the processing makes the sound the best.

Will you eventually offer ext4 support?
thank you

If you’re referring to USB storage connected to Lumin player, probably not.

If you run Roon on a Linux system ext4 will likely work.

I purchased a D2 at Axpona on Sunday. Rereading this thread, it looks like I have some burn-in to do, but I did switch most everything “off” in the Lumin, save Roon Support. I am extremely pleased with the results so far!
If you have done A/B test with DSD upsampling? Which to you prefer? What are your DSD settings?

1 Like

My previous comment on DSD upsampling (applicable to A1 / T1 / D1 / D2) is here:

I’ll leave the questions to other users to comment. There are a few related posts right above yours.

As per Peter’s post above, I have tried upsampling to DSD by the Roon Core/Nucleus, to be ‘fed’ as DSD to my A1.
I think there is a noticeable improvement in SQ doing it this way, but I think any perceived benefits may be system, and even source-file dependant.
I’d be happy to hear how you find it :grinning:

…and perhaps also mood dependant! I seem to prefer DSD for relaxed headphone listening and PCM on my speaker setup…the only small fly in the ointment for me is the click moving between the formats (which unfortunately is more irritating over headphones).

@wklie, Peter, could I please just confirm the output voltage on the D2 XLR outputs? Thanks.

D2 / D1 / S1 / A1 / T1: 4V rms on XLR, 2V rms on RCA.

X1 and T2 are different.

Thanks very much!

I’m looking at getting the Lumin D2 to replace my exaSound e20 mkii DAC and exaSound PlayPoint renderer streaming from a QNAP NAS. I use Roon with Tidal and my DAC does not do the final unfold of MQA files. As much as I like my exaSound units, especially the PlayPoint, it annoys me that I can only use it with their own DAC. I like the thought of an all in one unit like the D2, that I can add a DAC to in the future if I wanted to. I am feeding them through a DSPeaker anti-mode 2.0 > Simaudio i7 integrated amp > Anthony Gallo Ref 3.5 speakers. Can anyone advise if this would provide any noticeable improvement in SQ?