Sub-octave organ ranks extend the sounding range far below the written foundation pitch.
Evidence
Often, ranks that speak an octave below the foundation pitch of 8′ (manuals) and below the foundation pitch of 16′ (pedals) are provided, particularly on large instruments. Thus a 16′ bourdon, double open diapason or double trumpet might be found on a manual, and a 32′ contra open bass or double open diapason might be found on the pedals. Extremely occasionally, stops that sound two octaves below might be found, such as a 32′ contra violone on a manual or a 64′ gravissima or contra trombone on the pedals, as found on the John Wanamaker organ in Philadelphia and the Centennial Hall in Sydney, respectively. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1563
Categorization
- CANDY: The 64-foot stop in Sydney and Philadelphia’s Wanamaker organ make an easy elevator fact.
- XREF: connects to: Organ registration shifts heard fundamentals an octave below written pitch.; Large pipe organs include stops sounding one or two octaves below foundation pitch; Organ builders exploit a pitch illusion to extend sub-bass without actual low pipes — David Howard, Jamie Angus, coustics and Psychoacoustics, 1694 (+1 more)
Broader Connections
- Organ resultant stops create the sensation of pitches below any note actually sounding
#corroborates(0.95) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1650 - Large pipe organs include stops sounding one or two octaves below foundation pitch
#corroborates(0.90) - Organ builders exploit a pitch illusion to extend sub-bass without actual low pipes
#corroborates(0.90) — David Howard, Jamie Angus, coustics and Psychoacoustics, 1694 - Organ registration shifts heard fundamentals an octave below written pitch.
#qualifies(0.75)