I may have found a solution...talked to the manufacturer, Human Design, and they were not much help. Disappointing. So I called the web company I bought the Z1 through, cpap-supply.com and explained the problem. He wanted me to try something, and sent me (no cost) a "bacterial & viral filter", just ...

I guess many of us are in the same boat... Just received my Z1 last week, with the planned use for travel when with my wife. My sleep apnea is pretty minor so my doc says, so I only have taken my larger Respironics with me when we travel together (not when alone). I was shocked by the noise on the Z...