RE: Z1 muffler - help, please
The thing is, the concept is good, indeed in some ways pretty great, but sometimes you have to sacrifice concept (and money) to get it right, and if that means a from the ground up redesign instead of add-ons to address the problems, sure you save some money, but you also ignore the real problem and it will come back and bite you in the bum someday. So, the original Z1 had the many of the same problems of the Z1 auto, users on forums and customers complained about it, but instead of making the Z1 Auto a redesigned machine to address the problems, they simply used the same shell, coloured it a bit, and added the auto titrating algorithm.
What they should have done was make the shell a titch larger, made the intake and outlet standard sized, allowing for a fan and compressor that would be running at lower revs and allowing for some vibration dampening, and then release it, perhaps with an Android and M$ app for it. Then it would have been a killer machine, and maybe at most 10-20% heavier, which would still make it the smallest, lightest and now quietest machine on the market. Perhaps the Z2 will address these issues within the design process.
You see, it is easy to get 26 dB when you put the mike two metres from the device and let it run without actually breathing with it. Heck, I managed that at one metre (but not closer). But once you breath, the pressure of the EPR system on the motor, the vibration passed up the tube and a host of other things push the noise level up. Moreover, real life use is different from standardised testing. You are at most a few cm from the tube, the nose joint of the mask is right under your eyes, and the machine is around 70 cm away most often, and rarely more than 100 cm from you, which is also the maximum distance your bed partner is from your mask. So you have to measure sound from all those distances and areas of noise, while in use, or you can't get a true picture of the noise value and pressure. I think HDM fudged on this. Certainly my experience and the reports of others on this site and elsewhere would confirm this.
So my challenge to HDM is come up with a machine nearly as small and light as the Z1, as quiet as the PRS in real use (very quiet) and you will have not just me as a customer, but everyone I meet - I will sing the glories of you. Unless you insist to remain an Apple only system - then you and I have a religious issue that will not be assuaged easily. I don't have a smart phone, and if I did, it would not be iOS. I want to track my data on my PC, I might settle for tracking it on a tablet, android if need be, M$ even better (love my VAIO tablet) and you will have a fan for life. Keep the form factor, adjust for the extra size and needs I mentioned, and maybe make the display also data capable, and you will have a winner. As it is, you lost, at least in my country. Oh, and have a look at your Swiss distributor - I would call that profiteering....... nothing justifies a mark up that large.
(This post was last modified: 09-15-2015 07:19 AM by DocWils.)