Free reeds produce fewer high harmonics because absent shallot closing never fully halts airflow.

Evidence

A rapid amplitude change in a waveform indicates a relatively high proportion of high harmonics are present. The exact nature of the sound source spec­ trum depends on the particular reed, shal­ lot and bellows pressure being considered. Free reeds which do not make contact with a shallot, as found for example in a harmon­ ica or harmonium, do not produce as high a proportion of high harmonics since the air­ flow is never completely shut off. — David Howard, Jamie Angus, coustics and Psychoacoustics, 1231

Categorization

• XREF: connects to: Free reeds produce fewer high harmonics because airflow never fully stops — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1203; Free reeds produce fewer high harmonics than beating reeds

Broader Connections

• Free reeds produce fewer high harmonics because airflow never fully stops #corroborates (0.95) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1203
• Free reeds produce fewer high harmonics than beating reeds #expands (0.85)