Interesting that you feel most headphones seem to have stronger bass when ANC is deactivated. Most of the ones I've tested (both wired and wireless) seem to have boosted bass when the ANC is activated. Though most of my tests were with older headphones, back when sound with ANC wasn't as refined. Of the newer ones the Momentum had stronger bass when unpowered and The Symphony 1 had weaker bass when unpowered and with ANC deactivated but powered.
Plantronic, Samsung, BeoPlay, Sennheiser MM550-X. Those are the ones I have tried, where you can deactivate the ANC.
There the bass is definitely less present when the ANC is active.
About the wired vs bt sound, in that case almost all if not all Headphones which I have tested have a boomier bass in wired mode.
I am testing the ones you know I have here now, and all of them have a boomier bass (or much boomier bass) when wired. And have problems in balancind that boomy bass with other frequencies, so that finally the wired sound is a bit, bleah.
The Plantronics have in wired amped with ANC on almost the same sound of bt mode with anc off, but still boomier and with some imprecision on the bass.
The Beoplay had also a nicer sound with ANC on, in wired mode (where their boosted bass was even more boosted).
You basically asked two questions in the same sentence; if people with large heads also have problems with seal, and then wether the effect of thin bass caused by lack of seal is also affected/boosted by the ANC.
I replied to the first part of your question, and simply said I have no idea about the 2nd part of your question, since I would never use them unpowered anyway because of the bloated bass. Yes, I am aware that you can disable ANC separately on _other_ headphones, but I fail to see the relevance.
I think I'll leave your suggested test to someone else...
Sure, no problem, I know that moving the head with engaging music is not the style of northern people
(kidding)
But it was one question, bro.
"does anybody else have this of the clamping force on the M2AEBT not being enough to make the earpads seal perfectly
when chewing or moving the head forward and back or right and left (like when you listen to engaging music and you just cannot avoid moving the head),
so that finally the bass on bassheavy tracks
like this would distort because the leak of bass makes the ANC go crazy?
I am curious to know if
it is a problem which at least people with big heads would not have."
"it" = bad seal when chewing leads to bass distortion.
I did not ask if the seal on big heads is good. I have asked it the seal on big heads WHEN cheawing AND/OR moving the head like "**** yeah!" is good or if there is distortion (distortion = bad seal and ANC going crazy with bass).
About the unpowered sound, I do not find it boomier than the wired powered. To my ears the only difference between wired unpowered and wired powered is not the bass (which is 10% th same way too boomy bass) but a way better management of the other frequencies in the wired powered mode, although also those other frequencies sound way too boosted to my ears in that mode, compared to the beautiful, refined, smooth sound of the bt mode.
The wired powered mode remembers me of the BeoPlay H8 with their boosted upper mids.
About the relevance of the possibility to deactivate the ANC you may have missed the explanation of the reason why this distortion happens: it happens because when people chew or move the head the bass leaks due to the bad sealing and the ANC goes in conflict because tries to eliminate that bass, producing an antibass which will also leak and this is a loop and there is distortion.
It is in part a theory because what EXACTLY happens I do not know it, but it is a fact that it is due to the ANC, because I could reproduce it on the Plantronics when I lift the earpads with ANC active (anc not active = no problem).
So, I was pointing at the fact that to avoid this problem Senny should have made the ANC deactivable.