(01-28-2013, 04:20 PM)cam Wrote:(01-28-2013, 01:51 PM)vsheline Wrote:I still have the 604 but am trying out the Resmed machine.(01-27-2013, 08:26 PM)cam Wrote: I have the same thing on mine (set at 9) on inhalation. Plus the soft whistling sound on exhalation (but that is not bothersome).This is the second brand new unit and does the same. Am planning on dumping it in favour of a PRS 1 unit which apparently is much quieter and holds a lot more water.
Hi cam, welcome to the forum!
Your profile now says you're using a Fisher-Paykel 604.
Was the noise during inhalation coming from two new ResMed S9 machines you tried out?
Some S9 AutoSet users report their machine is very quiet. Others report noise occurs only in a small range of pressures and higher or lower pressures are quiet.
Pressure at the blower unit will be at least slightly different during inhale versus exhale, even if EPR is turned off, because the pressure dropped across the hose will be at least slightly different. Maybe the pressure change at the blower unit during inhalation versus exhalation is bringing it into and out of a noisy pressure range. This may explain why some hear the noise on inhale and others on exhale.
This is the 3rd Resmed S9 that I have tried out. They are all the same. I believe the EPR is turned off as I complained initially when I tried the first machine on vacation that you could hear inhalation and exhalation. After I complained, I think the technician turned the EPR off. Now you just hear the inhalation. and because the reservoir is smaller, after just 7 or 8 hours the water level is below the bottom mark. I think I'll give the Philips RS 1 a try. I'll revert with my thoughts afterwards.
Well just returned both of my new Resmed S9's and picked up a PRS1 to give it a try and it's very quiet in comparison but doesn't seem to have the same volume of pressure at my recommended setting of 9. Also the outflow seems to be somewhat blocked and so I find I can't breathe out freely.
Not sure if there is something wrong with this unit but I intend to call the supplier tomorrow and ask. For the time being, I have switched back to my FP 604.