Opinion, please?

Both of those sound like processing has been applied, (rather than being raw recordings).

C-1U has louder noise-floor at the start than at the end, as if a compressor (or AGC) is in operation.
H2 has a tremulous quality, e.g. particularly noticeable when you inhale at 2.0-2.5 sec, like a noise-gate kicking-in.

If the Windows audio enhancements in the recording* tab of windows sound have been disabled,
then there is another layer of audio enhancements in effect which needs to be disabled,
( I had this problem myself with a new Dell-Windows computer ).

[ * as opposed to the playback Tab, where enhancements should also be disabled ].