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Steinberg UR824 with Linux - performance

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This page presents some information on the stability of the driver under various conditions.

Of course the point of the UR824 is that it has very comprehensive monitoring and FX facilities in the box, so that for monitoring, you don't the audio path to go into the PC and back out. However, if latency is an issue in your application, here are some measurements.

So far, I have only tested with my i3-370M laptop. With a faster machine, you ought to be able to obtain lower latency.

Rate Configuration Frames / period Periods / buffer qjackctl claimed latency Measured latency xruns
44.1kHz SPDIF 512 3 34.8 46.6 no
44.1kHz SPDIF 128 3 8.71 12.2 #
44.1kHz SPDIF 64 3 4.35 N/A continuous
44.1kHz SPDIF 512 2 23.2 35.7 no
44.1kHz SPDIF 256 2 11.6 18.8 #
96kHz ADAT 512 3 16 21.1 #
96kHz ADAT 1024 2 21.3 31.3 no

# - if starting/stopping Ardour, opening browser etc.

Please let me know if you are able to provide more data for this table.

Test conditions:

  • Connect signal generator to UR824 analogue input 3
  • Route within UR824
    • route analogue out 1 / 2 from mix 1 / 2
    • route analogue out 3 /4 from DAW 3 / 4
    • set fader on input 3 to mix 1 / 2
    • set output level on analogue 1 / 2
    • set output level on analogue 3 / 4
  • Use qjackctl
    • set Frames/Period and Periods/Buffer
    • route capture_3 to playback_13
  • connect oscilloscope to UR824 analogue outputs 1 and 3 and measure delay between them.
Tuesday, 20th August 2019

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