Lumin Firmware Changes and RAAT

(Peter Lie) #1

Firmware 10.1 incorporates RAAT 1.1.23 that was released 4 days ago.

(Peter Lie) #2

Stereophile is suggesting some MQA certified DAC or network player passes non-MQA music to MQA processing. (This way it is technically easier to implement.)

Lumin does not do that. Lumin playback of non-MQA music does not go through MQA processing, while maintaining seamless switching among MQA, non-MQA PCM, and DSD music.

For simultaneous support of MQA over RAAT and non-MQA PCM over RAAT without going through MQA processing, RAAT 1.1.20 provided this possibility in June 2017.

(Peter Lie) #3

Firmware 10.2 integrates RAAT 1.1.28.

MQA DAC-side correction for A1 / T1 / D1 / D2 is improved.

For playback of MQA music, signal path may show an unknown filter - this will become meaningful with a future release of Roon.

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(Peter Lie) #4

It was made to conform to the MQA feature in Roon 1.5.

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(Peter Lie) #5

Just as Roon Build 334 integrates the latest MQA decoder library, Lumin Firmware 11.0 integrates the latest MQA decoder library as well, along with the latest Spotify Connect SDK. The benefit is that it further improves the MQA Rendering in both sound and signal path reporting when Lumin MQA capabilities is configured as “Renderer Only” in Roon.

People are starting to get MQA CD from Japan. We fixed an issue with decoding MQA inside Apple Lossless (ALAC) for those who rip MQA CD using iTunes to Apple Lossless. AIFF, FLAC, WAV had no issue.

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(Peter Lie) #6

Last week we received an e-mail from Roon Labs, they recommend that partner manufacturers upgrade to RAAT 1.1.31.

So today’s firmware upgrade for some models include the latest RAAT as specified. The other models will receive the latest RAAT in the next major firmware upgrade.

(Vic Sent POk) #7

With the most recent LUMIN firmware (11.0b) on my T1 and Roon update, I found that the signal path is now shown as “Enhanced” instead of “Lossless”. Is this what you are observing at your end? Is there re-sampling happening in the chain?

(Peter Lie) #8

This signal path is normal. MQA Full Decoder is classified as “Enhanced” according to Roon RAAT requirements.

By the way, you can try setting MQA Capabilities for Lumin to be “Renderer Only” instead of “Decoder + Renderer”, see if you hear any difference in sound quality or not.

(Peter Lie) #9

Lumin Firmware 11.4 incorporates the latest RAAT 1.1.33 to match Roon 1.6.

(Peter Lie) #10

Lumin Firmware 11.5 incorporates the latest RAAT 1.1.36.

Some models will receive this firmware later.

(Craig Palmer) #11

What improvements will that bring Peter?


Thank’s for the heads-up Peter!
Nice to see the D1 is still supported!


(Peter Lie) #13

From the Lumin Firmware Release Notes

  • Update Roon RAAT version 1.1.36
  • Add front panel MUTE display
  • Improve error handling for Qobuz server busy
  • U1 X1 T2 Fix AirPlay volume
  • U1 X1 T2 Add delay to digital output
  • S1 A1 T1 Fix HDMI output to Denon / Marantz AV receivers

RAAT internal improvements or fixes are not up to me to disclose.


Hi Peter,

No luck with fixing the click when switching formats on the D2 then?

(Peter Lie) #15

Sorry, no.


Can I get more details on this „U1 X1 T2 Fix AirPlay volume“

What was the error?
Did volume not work at all or…?

(Peter Lie) #17

The current design of Lumin (when not using Roon) is to apply a second-level volume from the iOS AirPlay device source, so that iOS app (e.g. YouTube) volume can be reduced by iPad volume buttons (from the first-level volume in Lumin app or Roon that is treated as the maximum volume). Previously the volume buttons had no effect on our newer models, but this has been fixed.

The first-level volume in Lumin app (or Roon) has not been a problem, so even before this fix there was no risk of damaging speakers for those using a direct to amp configuration, as we do in our Munich and Hong Kong shows.