whispering chamber

physics

Written by

The Information Architects of Encyclopaedia Britannica

Last updated

July 15, 2026

Quick Summary

A whispering chamber, also known as a whispering dome, is a space, such as a gallery or dome, designed so that sounds made in one area are reflected by the walls and concentrated in another. This allows very quiet sounds to be heard from a great distance. This phenomenon is a result of the reflection of sound waves.1

In physics, sound waves, like other waves, can be reflected. When a sound wave encounters a surface, it bounces off. In a whispering chamber, the curved surfaces, often elliptical or dome-shaped, are specifically designed to focus these reflected sound waves to a particular point. This is why domes in cathedrals and capitols can sometimes act as whispering chambers. Conversely, smooth, curved surfaces can also cause unwanted echoes and sound focusing in auditoriums, which is generally undesirable for musical performances.23

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

3 Britannica Sources

Ask Britannica AI about this topic

Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.

conic section
Post-Greek applications
…architects created a fad for whispering galleries—such as in the U.S. Capital and in St. Paul’s Cathedral in London—in which a whisper at one focus of an ellipsoid (an ellipse rotated about one axis) can be heard at the other focus, but nowhere else. From the ubiquitous parabolic satellite dish…
Read More
…architects created a fad for whispering galleries—such as in the U.S. Capital and in St. Paul’s Cathedral in London—in which a whisper at one focus of an ellipsoid (an ellipse rotated about one axis) can be heard at the other focus, but nowhere else. From the ubiquitous parabolic satellite dish…
Read More

sound
Reflection
…onto another—an arrangement called a whispering chamber. Domes in cathedrals and capitols closely approximate the shape of an ellipse, so that such buildings often possess focal points and function as a type of whispering chamber. Concert halls must avoid the smooth, curved shape of ellipses and parabolas, because strong echoes…
Read More
…onto another—an arrangement called a whispering chamber. Domes in cathedrals and capitols closely approximate the shape of an ellipse, so that such buildings often possess focal points and function as a type of whispering chamber. Concert halls must avoid the smooth, curved shape of ellipses and parabolas, because strong echoes…
Read More