A lot of the noise IS sometimes the result of the mask instead of the machine itself. People commonly refer to "machine noise" when it is the mask sounds that they may hear louder. I have recently (2 weeks) started with my new Respironics DreamStation Auto CPAP and am amazed at how much less sound it develops over my previous Respironics Remstar Auto A-flex system one. I am hesitant to offer any percentages of noise level less as that is in the eyes of the beholder. Some nightly interference to some may be a welcome white noise to others. BUT the DreamStation IS quieter. I will be writing up my summation of the DreamStation in a few days.
Yesterday is history; Tomorrow is a mystery; Today is a gift; Thats why its called "The Present".
I am on my 3rd Resmed A10 due to noise. They start out quiet but after a few months they get louder. This one is loud now too...
I have an Airsense 10 Auto that was really noisy , and yes it sounded as though Darth Vader was sleeping with me. I persisted with sending the machine back to be repaired under warranty, and when I didn't get satisfaction I evoked the "Under Australian consumer law it is not fit for use, so lets see what the authorities who look at these things think about your service" move. The machine was sent back to Resmed here in Sydney, the technical department head called me to keep me in the loop while they looked at the problem. The end result was that my machine had a fault with two internal seals, and that fault could have extended to a number of machines. Mine is as quiet as a mouse now and is working as all the sales blurb says. Speak up loudly and persistantly about the problem, it seems to be the only way to get heard.
I use the Airsense 10 Autoset with nasal pillow mask and so far it's been very quiet. I do hear my inhalation and exhalation but I'm the only one who can hear it. You can barely tell the machine is on.
oftentimes, sound is transmitted up the tube.
My A10 has been dead silent since I started using it about 1.5 years ago. My pressure is set to 9, and maybe that has something to do with it. Sometimes I get a whistle from the humidifier connection but it is easily fixed by wiggling it a bit. Maybe I'm just lucky.