Headsetist
New Head-Fier
All I can say is your pair seems to be an outlier and please contact support.
Is it an outlier?
I can confirm that this is the case with at least 2 additional Penrose headsets in addition to this person's.
Toggling sidetone does nothing to the low buzzing sound coming from these headsets, and from what I've seen enabling sidetone does not increase it either.
This static sound is louder than the one found in the Arctis Pro Wireless, which is well known for its static sound coming from the sidetone that cannot be turned off.
As an update to my earlier "mini-review":
I do think this is a great sounding headset and the static is not a deal-breaker for me although it might be for some.
As for the clamping force, it does seem to be quite hard clamping (noticeably more than the Mobius I tried but maybe that one was worn in) but I have mitigated it somewhat by manually rotating the cups, they don't adjust to your head on the lateral axis like most other headphones and have to be placed, maybe this also is due to them needing to be broken in.