(03-09-2013, 10:39 PM)Sleepster Wrote:
(03-09-2013, 09:58 PM)HILLTOPPER Wrote: After reading this thread the other day I payed attention .. Seems My res med s makes WAY more whistle when the water chamber is FULL , not much at all when almost empty and only on Exhale. Go figgure?
This could be a hint. Anybody notice a difference in pitch with the level of the water tank?
After reading this I checked it out:
With any one particular mask the whistling was the worst with the H5i disconnected and the hose connected directly to the S9 or with the H5i connected and the water chamber filled to the max line (or actually just a tiny bit above it, where I normally fill it to). There might have been a little difference between these two, but not enough to tell by just listening.
With any one particular mask the whisling was least noticeable with the H5i connected but empty.
Worst whistling was with nasal pillows and hose connected directly to S9, or nasal pillows and hose connected to H5i with full tank.
Whistling was least noticeable (not noticeable at all to me even when exhaling hard) with full face mask and hose connected to empty H5i.
Whistling was still coming from inside S9 unit and not from the H5i.
All of this seems to suggest (with my extremely limited knowledge on these things) that it is coming from the flow generator and has to do with flow resistance.
It seems to have consistently held that the more room I introduce into the system (i.e. higher volume of air between the flow generator and my lungs), the less whistling I get. The more I tighten the system up - less air space (i.e. less air to compress on exhale) the more whistling I get.
I wish I had a larger diameter hose like a standard hose (NOT SlimLine) or a ClimateLine Max to check. I might just order one (standard full size hose) to find out.
It would be nice if some others would try the full/empty water chamber thing and/or standard/slim hose (if you have 'em).