Aequalprinzipal German
Aequal German
Aequale German?
Äqual German
Chormassprincipal German

Old German organ-builders sometimes used the prefix Aequal to indicate a stop of unison (8') pitch. When used alone, it indicated an 8' Principal. Wedgwood lists the name Chormass as a synonym for Aequal; Adlung writes: “[Principal] is also called Aequalprincipal because it matches the range of the human voice. It is likewise called Chormassprincipal” and “Chormass is probably understood to be the same as 8' because it has the same pitch as the human voice”.

See also Aequal-Gemshorn, Thubalflötchormass, Unterchormassbass.


No examples of the prefix Chormass are known; only one example of Aequal is known. Contributions welcome.

Aequalprincipal 8', Great; Chapel of the Resurrection, Valparaiso University, Valparaiso, Indiana, USA; Schlicker 1959.


Adlung[1]: §115 Aequal, §125 Chormass, §137 Doppelt, §171 Oktave, §177 Prästant. Audsley[1]: Aequalprinzipal. Audsley[2]: I.XIII Äqualprinzipal. Irwin[1]: Aequalprinzipal. Maclean[1]: Aequal. Sumner[1]: Aequale. Wedgwood[1]: Aequal, Chormass.
Copyright © 2001 Edward L. Stauff, all rights reserved.
AequalPrinzipal.html - Last updated 31 July 2003.
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