You’re very excited because you just received your ResMed S9 Autoset or Elite. You get it home, plug all the parts together, put on your mask and start drifting off to sleep. Suddenly, you can’t help but notice that every time you exhale there is a very very faint whistle coming from the S9’s rear.
It’s not that noticeable, yet for some of us, it’s a bit like the Gilligan’s Island theme song or the SpongeBob SquarePants theme song. You just can’t get it out of your head.
The sound can be slightly different from machine to machine, sometimes higher in pitch, sometimes lower, depending on year and origin of manufacture. Continue reading “ResMed S9’s Exhale Whistle”