I have an audiologist friend at Wichita (Kan.) State University who actually pulls off earphones of students he sees and asks, in the interest of science, if he could measure the output of the signal going into their heads.
I have an audiologist friend at Wichita State University who actually pulls off earphones of students he sees and, in the interest of science, asks if he can measure the output of the signal going into their heads.
Insert earphones can boost the signal by as much as six to nine decibels. That's about the difference between the sound of a vacuum cleaner and a motorcycle. It's a significant difference.