Has Anyone Had an Extended Hearing Test Covering Ultra Low (Under 100 Hz) Frequencies?

Hey

I haven't been able to find any examples of extended audiograms that test under 100 Hz. Has anyone ever had that tested? It would help with my investigation into the cause of low frequency tinnitus. Part of the reason we may have no answers is because none of us know if it is due to hearing loss in that range.

Also if anyone has any information on how, and, how easily, low frequencies can be damaged by noise, please share your knowledge, many sources say ultra low frequencies aren't often easily damaged and definitely far from the first place to be damaged from noise.

There also appears to be a lot more people with tinnitus below 100 Hz than say 200-800 Hz. Probably including many of those who think they hear the mysterious Tao hum/world hum without realizing it's simply faint low frequency tinnitus.

100 Hz is roughly the upper limit of sounds that feel vibrational so many of us are left wondering if it is mechanical in nature - especially when there's seemingly no way to accurately test hearing loss in that range.