So I wanted to know whether the ultrasonic version of emperor is more effect than the Masked version. The Masked version is only 40 minutes long. So does the longer time duration of the ultrasonic version make it effective?
I don’t believe that one is more effective then the other. Its more of case of “one shoe size” doesn’t everyone hence the two options. For me its not practical to listen to ultrasonic versions. I have to use masked. To simply answer your question both versions are equally effective depending upon your circumstances.