In the video you cannot really hear the sound but by sticking my toes in the port it becomes clear that the sound is being created by air moving through the port. The chuffing is way louder in real life and is normal. All subs can be made to do this. I watch stuff way louder then I should with this relatively small sub and I've never heard it chuff until running a 20Hz Youtube video. I also don't think Youtube video can be trusted as a good "source" for stuff like this. I have a Panasonic UB820 Blu-ray and Denon X3500H avr... compared to my discs all the various streaming services vary greatly, and the Youtube app on my 2022 LG OLED C2 is the loudest of them all.

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