Which is the quietest cpap machine

Re swapping the blowers between the S7 & Spirit. If you look at the s7 disassembled photos you can see that the blower is a big assembly with all its noise baffling in the one large plastic assembly. The in hole & out hole of the air are part of the blower not the xPAP case.

The only other bits of significance are 3 rubber mounts that the blower sits on else it is the mother board & the power pack.

The noise really does seem (clearly to me) to be coming from the blower.

I can't figure other then via the mode of operation, why the noise diff is so significant.

With the S7 I am not disturbed by the blower noise with the Spirit both my wife and I notice it. I was putting a pillow over it to quieten it.

Cheers

DSM

This is hard for me to understand, when my ResMed Auto Spirit is quiet and so is my S7 Lightweight.

I feel something is wrong some where.

I have the PB Goodnight 420G - it is a basic CPAP - not autopap. I think it is very quiet. It doesn't bother me at all. Additionally it is tiny. Takes no space on the nightstand and takes no room in your suitcase when you are travelling.

I would venture to say that all the newer machines are VERY quiet.
There may be some very slight individual variation, but nothing to compare with the earlier models.
Keep in mind, that IMHO, most of the noises likely originate in the hosing and mask structures.
Sometimes I will have the airflow go from the hose thru my pillow and is picked up thru my skull nones, mainly in the area behind my ears.
Shifting the oses and/or my head will lessen this.
Another factor that cannot be ignored is the way a person sometimes hyperfocus on an noise that is ignored by others. This may be especially true for our mates.
My original Breeze mask had a noticeable noise from the exhaust port. When I got a new one, it was TOTALLY quite, as was the DV9001D.
My previous remstar choice and mask put out a sort of white noise that was very relaxing.
Both moi and my wife missed the older noise that was soothing. '
Maybe it is a matter of perspective.
Aggravating noise must may be in the ear of the hearer.
Maybe it is like working in a store where the same music plays over and over. It drives some employees batty and is ignored by others.
I could be wrong.

Tom has a Respironics with C-Flex and it is so noisey.

He told me where it came from and he blames it on that.

Interesting results with the blower swap. Maybe there is more variation in the foam insulation than I would have thought--probably varies based on production lot. . .

Foam density, pore size, etc. might be fairly hard to control such that the same sound absorbtion is achieved from lot to lot.

Try switching the foam insulation (if you can) but not the blower motors and see what happens.


-John M