timing reference and umik-1

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Preamp, Processor or Receiver
Logitech Z906
DAC
AMD FCH Azalia
Computer Audio
SPDIF output with alsa, pipewire, wireplumber on Fedora 40
Streaming Equipment
Kodi
Front Height Speakers
33 in
Middle Height Speakers
30 in
Rear Height Speakers
57 in
Video Display Device
X11/VGA + X11/DVI
I experienced inconsistencies with the delay to the acoustic timing reference in the past and that's the reason I make 3 measurements and discard those out of range. Mic is UMIK-1.
However I was in a hurry here for a quick test regarding polarity.

Now I'm interested in determining what is causing this issue. The UMIK-1 itself? The system configuration?

On Debian 12 , where it seems to be way most frequent, I have this message all the time REW is running. It's non stop:

Code:
2024-11-04T13:30:44.066661-05:00  rtkit-daemon[1370]: Warning: Reached burst limit for user '1000', denying request.
2024-11-04T13:30:44.275438-05:00  rtkit-daemon[1370]: Warning: Reached burst limit for user '1000', denying request.
2024-11-04T13:30:46.137145-05:00  rtkit-daemon[1370]: Warning: Reached burst limit for user '1000', denying request.

Here we have 3 measurements for a 3-way speaker enclosure (with 3 power amps; electronic crossover). We should have the same difference between T0 and REF, The first one is the speaker with all the 3 power amps running; the second has it's midrange power amp turned off; and the last has its Low and High power amps turned off, leaving only the midrange active. I could understand if the midrange measurement were off range as there is no tweeter for the acoustic timing reference and the upper limit for the midrange is 4500 Hz.

350-400 msec are expected.

Capture d’écran du 2024-11-04 15-46-06.png Capture d’écran du 2024-11-04 15-46-21.png Capture d’écran du 2024-11-04 15-46-31.png
 
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