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I tested this setup with this youtube video (25 - 150 Hz Audio Sweep): 

 

When I toggle off the sub in the app, I can hear the bass ramp up from 40 Hz.

When I use the sub then I can hear it from 25 Hz, but at 65-75 it gets quiet. Not using the sub in this range produces more bass than when using the sub.

Is this a bug with the sub or what is the reason for this? Will it be fixed? Sub level 0, bass -1, treble -2 and no speech enhancement. Tested with and without trueplay.

Also, I saw some comments online stating that when toggling off the sub in the app, it’s as if you are still using it, except it doesn’t produce sound. This does not seem to be true. Seems to me that in that case the arc ultra is using all its bass, since I could hear the bass from 40 Hz when toggling the sub off, and when having it on at -15 the bass had low volume until about 75 Hz, as opposed to when having it toggled off. I can’t find the post with this claim, but I am pretty sure I read it on here somewhere. Is my conclusion correct? If so that’s good, since I wouldn’t want the Arc Ultra to be nerfed because I toggled the Sub off.

 

Tested with my old non-Sonos soundbar/sub and didn’t have the same issue. The sound is smooth throughout the 60s and 70s. It’s dipping in that region when using the Arc Ultra and Sub.

I can only assume it has something to do with the new design of the Ultra. It could very well be the fact that the Sound Motion woofer is still enabled when the Sub is added causing Trueplay to adjust the equalization of the low pass filter incorrectly. The SM woofer could also be cancelling some of the frequencies produced by the Sub if they are out of phase with each other.

I am just guessing, but this is something techs at Sonos should look into. There are many posts about the Sub not performing like it should when paired with the Ultra.

Maybe the SM woofer needs to be disabled when in this configuration?

I can only assume it has something to do with the new design of the Ultra. It could very well be the fact that the Sound Motion woofer is still enabled when the Sub is added causing Trueplay to adjust the equalization of the low pass filter incorrectly. The SM woofer could also be cancelling some of the frequencies produced by the Sub if they are out of phase with each other.

I am just guessing, but this is something techs at Sonos should look into. There are many posts about the Sub not performing like it should when paired with the Ultra.

Maybe the SM woofer needs to be disabled when in this configuration?

Looks like it’s the placement. I put it further away and now it dips in the late 50s, but is overall better.

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