Its common complaint with the S9, luck of the draw ... not all the S9 are affected with the noise and some are louder than others
From what have read, there is no remedy to fix the noise, its something to do with tooling, It,ll cost ResMed millions of dollars to fix the problem but they are not going to do that or recall the affected machines
ResMed had a recall for the S8 ... form memory its for electrical problem
ResMed won some design award for the S9 in 2010, don,t think they might won this award if the facts of noise issues were known
My advice, if the noise is loud enough to disturb you, ask for replacement, some people had the motor replaced and they still had the problem
Other than the noise complaint, S9 is great machine but ResMed is lousy Australian company adament to rip-off Australian users ... shame on them
I agree with Zonk, also you don't want to have it on the floor or under your bed as it will pick up dust, you want it back on your nightstand around head high level, time to return it quickly and get a quiet one, mine doesn't make a sound, the only thing I sometimes hear is my breathing which is quiet a nice noise
If the noise is still there with a new filter and without the humidifier, yeah, take it back. If it is loud enough to keep you awake, definitely take it back. Explain what you did to try and eliminate the noise. If they refuse, mention the better business bureau.
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Since it is so new, I would take it back.
Ohhh, I didn't realize that S9's had a noise problem. I'm really lucky mine is nice and quiet, especially since I bought the thing on Craigslist.