The diapason of a quray consists of three octaves. D'Or's voice has a range (or "diapason") of more than four octaves. Female chest register singers have only a low diapason of one octave to 12 notes. C13 to E29 of the Open Diapason are in the facade. The great has a fine if not loud open diapason. He has also contributed articles to "The Diapason" and "The Journal of American Organbuilding". He is a leading performer on the Bulgarian music label Diapason Records (). A stop of diapason type may or may not actually be labelled "Diapason". Her CD "Liaisons" received a "Diapason d'Or" by French magazine Diapason in 2011. By 1860 most theaters in Paris had lowered concert pitch to "diapason normal". The surround recording released at Kairos was awarded the Diapason d'Or. Several times his CDs won prestigious European awards, including the "Diapason d'Or" and "Choc". The "diapason normal" resulted in middle C being tuned at about . In 2001, his recording of Beethoven's "Diabelli Variations" won the Diapason d'or.