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.
Original website compiled by Edward L. Stauff. For educational use only.
AequalPrinzipal.html - Last updated 31 July 2003.
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