Re: 'pressure at the ears' visiting an anechoic chamber ("Richard J. Fabbri" )

Subject: Re: 'pressure at the ears' visiting an anechoic chamber
From:    "Richard J. Fabbri"  <fabbri(at)NETAXIS.COM>
Date:    Fri, 23 Oct 1998 14:35:22 -0400

Malcolm, >>> When visitors enter -for the first time- our (rather large) anechoic >>> chamber, they are always complaining about the strange 'pressure >>> at their ears'. Similar as listening to 'much out of phase' signals in >>... >> > >I'm pretty sure that the ear-popping is due to the pressure change as the >door is pulled shut. The anechoic chambers I have been in have a door >jamb much like a tunnel. You pull the door shut and the pressure in the >room increases. I suspect our ears have very little experience with such >pressure changes in normal life. ... This is a very strange sensation. ... I experienced it at CBS Labs in the early 70's. ... However, the tech who ran the chamber (speaker & mic testing) always left the door open as he was always going in and out to make adjustments/changes. ... So, I'm certain my own experience was with the door open. ... I've asked Ronald some questions and suggested some simple experiments to possibly perceive further effects. ... I also believe this is, as you and Al Bregman have commented, a learning issue but, due to the novelty, this may be an opportunity to learn something fundamental about hearing. Rich McGill is running a new version of LISTSERV (1.8d on Windows NT). Information is available on the WEB at

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