I have a ResMed s9 and pressure setting of 11. It works great and I love it. I recently bought a ResMed S8 for the firehouse because traveling with my S9 every third night is a pain.
When I use the S8, although the pressure is the same and I had it tested at a local CPAP store, it feels like it's only 2/3 of the S9. I can barely sleep. I tried different tubing and nasal pillow size with no improvement. The tech at the store says my S9 is blowing 150 lpm but he doesn't know what the S8 is blowing.
I don't think I need more pressure but I might need more volume. Any suggestions???
The tech used the manometer for both. I had them both with me at the store. He tested the S9 and then removed it and tested the S8. Both registered exactly 11.0. While I was sitting there, I put each machine on and the S9 sounded like a tornado compared to the S8.
He used a chart from the S9 instruction manual to estimate the LPM but didn't have a manual for the S8 so he couldn't tell me.