CPAPtalk.com

palerider wrote:

Therapist wrote:Do I have to spell things like this out for you?

clueless, and rude,to the very end.

Agreed.

WindFlyer wrote:It is audible through the air stream.

One thing that helps dampen noise through the hose is a hose cover. Here is an example - https://www.cpap.com/productpage/snuggl ... cover.html

Also, if you use the machine without a humidifier (I do.), more of the machine noise will travel down the hose.

Don't worry about this -- your ancient machine compared to the new models is like comparing night and day. The new Air 10 series is virtually silent and that one I have heard with a bilevel version, actually. The vast majority of the noise comes from the mask vent itself. If you want to stop that then you need a super quiet mask, like the P10 series with a 'screen' or 'mesh' vent. Or just don't breathe in and out....

You will be just fine. The new machines are super quiet even with EPR.

If you cant stand any noise at all, you could always just set the new machine to run in a fixed pressure mode with no EPR/Flex, etc. But then again, even fixed CPAPs, including old ones, still do change speed occasionally to deal with maintaining pressure when there are leaks, etc.

And, of course there are always earplugs, or even an add on white noise machine/phone app, etc.

hyperlexis wrote:And, of course there are always earplugs, or even an add on white noise machine/phone app, etc.

earplugs don't help with conducted noise coming up the hose and into your head, however.

Hi Windflyer. Good to see you around. Every time I've changed machines or even masks there's been a couple nights of adjusting to the new sounds but then I'm ok. Fortunately I'm not very noise sensitive. Can only imagine how it must be to one who is. I've used ResMed machines at straight pressure, auto, and bilevel. Used Respironics at straight pressure. Gotta say my S9 VPAP S is impressively quiet. I expected the changing pressures to be more noticeable because I had heard a friend's old bipap and it sounded almost like a hospital ventilator. I would think at your pressure of 20 there would be some sounds. I'm impressed that you have so successfully used straight pressure at 20 all these years. I'm just at 13, but I was amazed at how much easier using this machine was than when at straight pressure. Hopefully when you do need a new machine you will be equally surprised at the quietness. Maybe you can hear one prior to purchase. Or find someone's old S6 for a steal. Good luck.

avi123 wrote:WindFlyer, as I understand it, the turbine impeller inside most CPAPs creates the pressure (CM of water) by it's speed. So what you hear is the change of speed between inhaling and exhaling if the pressures are not the same. If you would run an S9 CPAP like the Elite, without any EPR, then the sound should be without wining, I think, and I can try it out since I also have an S9 Elite. Overall, I like to hear my S9 Autoset wining. It sort of masks my Tinnitus.

It's more complicated than that.

At a fixed fan speed, the pressure will vary as the flow rate varies. Some designs have more pressure variation with flow rate. I think the older designs may have varied fan speed less with flow rate.

The newer designs have more nimble fan control and better pressure sensing. They probably do tend to change fan speed more quickly. Older designs may not have only worried about average pressure where the newer ones speed up and slow down the fan speed as you inhale and exhale in order to keep pressure constant.

i.e. I think the newer machines do vary the fan speed a lot more than old ones.

hyperlexis wrote:Don't worry about this -- your ancient machine compared to the new models is like comparing night and day. The new Air 10 series is virtually silent and that one I have heard with a bilevel version, actually. The vast majority of the noise comes from the mask vent itself. If you want to stop that then you need a super quiet mask, like the P10 series with a 'screen' or 'mesh' vent. Or just don't breathe in and out....

You will be just fine. The new machines are super quiet even with EPR.

If you cant stand any noise at all, you could always just set the new machine to run in a fixed pressure mode with no EPR/Flex, etc. But then again, even fixed CPAPs, including old ones, still do change speed occasionally to deal with maintaining pressure when there are leaks, etc.

And, of course there are always earplugs, or even an add on white noise machine/phone app, etc.

While not entirely wrong, I think the picture is a little less rosy than what you present here. Many of the newer machines are more noisy than people think.

I think someone still makes machines that run at a set fan speed. The pressure will vary during a breath cycle.

Hang Fire wrote:I think someone still makes machines that run at a set fan speed. The pressure will vary during a breath cycle.

that's hard to imagine.

Hang Fire wrote:I think someone still makes machines that run at a set fan speed. The pressure will vary during a breath cycle.

There is a thread on here by a guy that uses one. I haven't been able to find the thread.

If you get the blower speed set high enough to keep the airway open on inhale, the therapy can be good.

I can imagine if you have high pressure needs, exhalation could be a problem.

(I'm surprised Den doesn't use one of these models. )

A few weeks ago I added my Oasis pass-over humidifier between my System One and my hose and it greatly reduces the conducted sound up the hose.
I recommend it.

If you realy want a fixed pressure one. I have a 15yr. old Develbiss with about 300 hrs on it, with humidifier still in the original box with the original mask. .... just let me know.

grayghost4 wrote:If you realy (sic) want a fixed pressure one.

This thread is confusing. According to what he put in his OP,

WindFlyer wrote:The Respironics I borrowed had a blower that was speeding up/slowing down upon inhale/exhale. I understand that this is to maintain a consistent pressure. However, I can hear this variance in speed and it drives me crazy!

... he wants to avoid fixed pressure and go with fixed blower speed.

My System One 550 got increasingly flaky the last few weeks (multiple attempts needed to start it sometimes) so I bit the bullet and bought a new 60 series thru Craigslist.

The new one is noticeably quieter than the '50. With the pass-over humidifier in the circuit I literally can't hear the pitch of the blower through the hose.