Stopped organ pipes trade space savings for weaker harmonic spectra

Evidence

A stopped organ pipe has an f0 value that is an octave below that of an open organ pipe (Example 4.2), and, where space is limited in an organ, stopped pipes are often used in the bass register and played by the pedals. However, the trade-off is between the physical space saved and the acoustic result in that only the odd-numbered harmonics are supported. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1183