Numbness

[Shannon]

Does the masked format seem to have any influence on it?

Masked seems to contribute less to the numbness. For ultrasonic though, every time I turn on my ears feel like it's on an airplane, the feeling you get during take off/landing that you have to open your jaws wide open. I do that less often now but the happened much more often when I first started listening. There was a period of time where I got numbness on the left hand which disappeared after a while. Now it's on the right side of my head. Could it be a problem of sleeping position? It feels like my face / head got covered by something. They have less sensitivity

In that case, I would suggest you stop subs for a while and see what the numbness does. If it remains, then it's not likely an effect of the subs. If it does not, then you'll have to consider what you want to do, as such a side effect is pretty hard to explain.

But if the masked format contributes less, it may have to do with volume and intensity.