08-27-2017, 01:19 PM
This S9 sounds like a kazoo
Well,about two years ago I took out of service an S9 that had developed a wheezy sound when I exhaled (IIRC). Worse after running all night than when first started up. I figured probably a bad bearing in the blower. But I upgraded to the PR SystemOne Auto. Bought a used one off of CL with about a dozen hours run time and liked it so much better than the S9 that it became my primary. So this one sat unused since the start of 2015.
But as some may have read, I have been going through an exercise measuring current draw on any PAP device I can to build a little database for run times on my backup batteries. So I finished with the Intellipap Auto and last night switched to the S9 (yes I know that the ResMed folks include it in their battery guide, but I suspect they have been more on the, say, conservative side in publishing their numbers (that was the case with the S8 Auto II) and I wanted more realistic numbers for my application). So, anyhow, as it was in easy reach, I hooked the "bad" S9 up to my 12V setup for a week-ten day test.
It was a little wheezy going to sleep. By the time I got up at 4:00 for a bathroom break, the noise was full time and I swear it sounded like a kazoo. It varied in pitch up on inhale, lower on exhale, but always there. Kind of like the HDM Z1, but at a much, much lower volume level. And like the Z1, it seemed that the sound was coimng up the tube. And definitely sounding like a kazoo.
Mostly, S9s have no perceptible sound. I think for this one, I may finish out the test and then try the good S9 (also unused since early 2015) in the same test just to see if there is a difference in current draw. Then I don't know what I should do with the one in question: keep it against the slight possibility that it may some day be the only functional PAP I have access to, or go ahead and chuck it.
Note that I got this particular S9 unit as a lightly used backup/travel unit from SecondWind and they were very gracious when I discussed the initial wheezy sound problem with them a couple of years ago, cutting me a screaming good deal on the S8 Auto II, factory new in box.
OMMOHY
But as some may have read, I have been going through an exercise measuring current draw on any PAP device I can to build a little database for run times on my backup batteries. So I finished with the Intellipap Auto and last night switched to the S9 (yes I know that the ResMed folks include it in their battery guide, but I suspect they have been more on the, say, conservative side in publishing their numbers (that was the case with the S8 Auto II) and I wanted more realistic numbers for my application). So, anyhow, as it was in easy reach, I hooked the "bad" S9 up to my 12V setup for a week-ten day test.
It was a little wheezy going to sleep. By the time I got up at 4:00 for a bathroom break, the noise was full time and I swear it sounded like a kazoo. It varied in pitch up on inhale, lower on exhale, but always there. Kind of like the HDM Z1, but at a much, much lower volume level. And like the Z1, it seemed that the sound was coimng up the tube. And definitely sounding like a kazoo.
Mostly, S9s have no perceptible sound. I think for this one, I may finish out the test and then try the good S9 (also unused since early 2015) in the same test just to see if there is a difference in current draw. Then I don't know what I should do with the one in question: keep it against the slight possibility that it may some day be the only functional PAP I have access to, or go ahead and chuck it.
Note that I got this particular S9 unit as a lightly used backup/travel unit from SecondWind and they were very gracious when I discussed the initial wheezy sound problem with them a couple of years ago, cutting me a screaming good deal on the S8 Auto II, factory new in box.
OMMOHY
