WELCOME! to the forum.!
I didn't hear anything out of the ordinary but hang in there for more ideas. You might let your DME, )Durable Medical Equipment,) company know about your concern.
Good luck to you with your CPAP therapy.
They sound like they are on the quiet side but hard to tell listening to a sound clip. In the quiet of the night, its a different story. I have been complaining that my Elite is as loud as hell in comparison to the Autoset rentals I have used. I am on my third replacement and it's still bad. Last week I tested an Elite rental machine side by side with my Elite machine and the difference was very noticeable (both at start up pressure and set pressure). I am still waiting to here back from my supplier. To quell the disturbance abit I have resorted to placing my machine in the draw of my bedside table.
I have noticed the same with mine. What I tried successfully is to place my finger 2 or 3 seconds in the air release hole that is in the tube that connects the air hose to the mask. It seems there is a kind of diafragma that loses its place, but when blocking air release with finger it resets. In the end I think it is a defective engineered product and would like to be advised of one good mask who doesn't need me to wake up and reset the mask during sleep
I have had my Resmed Airsense 10 Autoset since January 11. After listening to your sound clips, mine sounded like that on a few occasions in the first two weeks. However I no longer hear it. Not sure if it has gotten quieter or my ears have become numb to the sound. My wife, bionic ears, has not said a word so it passes that test for me.
I hope the sound subsides for you to a usable level.