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Perception that something may be wrong in my Arc

  • March 15, 2026
  • 1 reply
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Hi everyone,

I’m writing because I feel my Sonos Arc Ultra isn’t performing as it should. I’ve noticed a few specific issues:

  • EQ adjustments: Sometimes, I don't notice any change when I increase or decrease the Treble or Bass (especially the Bass) through the app. I don't have an external subwoofer; I'm only using the one built into the soundbar itself.

  • Subwoofer testing: To verify that everything is working correctly, I’ve been using the test samples found on this thread: [Link]. When I run the test, the subwoofer channel doesn't produce any sound. However, if I play YouTube videos to test low frequencies, it responds well down to 30Hz (which is quite good). Could someone else without a standalone Sonos Sub run the same test and let me know if the subwoofer channel triggers any sound for them?

  • Volume fluctuations: I notice significant volume imbalances when watching movies that are not Full Dolby Atmos 5.1. There are constant peaks and dips, especially with dialogue—voices feel too quiet, and then action scenes or loud noises suddenly spike in volume. I’ve already performed TruePlay several times, so the room calibration should be correct.

Has anyone else experienced similar issues with the Arc Ultra standalone setup? Any advice would be appreciated.

Best answer by AjTrek1

Most of what you have mentioned is personal perception. However, that’s not say that some of the Arc sound parameters could be slightly off.

Using pre-programmed sound analysis programs are really not suitable for soundbars. The only ones I would trust are those programs developed by the soundbar manufacturer.

  Variations in audio content when viewing a movie are quite often due to the sound mixing. When streaming bandwidth fluctuations can be a cause as well.

Your best option is to run a diagnostic the next time you experience one of the anomalies you spoke of within 10 minutes of the occurrence. Record the reference ID but don’t post it in the community. Afterwards call Sonos tech support to discuss the data.

Edit: You might also run Trueplay in the Sonos app if you have or can borrow an iOS cell phone. 

1 reply

AjTrek1
  • AjTrek1
  • Answer
  • March 15, 2026

Most of what you have mentioned is personal perception. However, that’s not say that some of the Arc sound parameters could be slightly off.

Using pre-programmed sound analysis programs are really not suitable for soundbars. The only ones I would trust are those programs developed by the soundbar manufacturer.

  Variations in audio content when viewing a movie are quite often due to the sound mixing. When streaming bandwidth fluctuations can be a cause as well.

Your best option is to run a diagnostic the next time you experience one of the anomalies you spoke of within 10 minutes of the occurrence. Record the reference ID but don’t post it in the community. Afterwards call Sonos tech support to discuss the data.

Edit: You might also run Trueplay in the Sonos app if you have or can borrow an iOS cell phone. 

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