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Table 1 Description of the available operating modes—digital filter settings—for the investigated electronic stethoscopes, accordingly to the data provided by the manufacturers

From: Sound differences between electronic and acoustic stethoscopes

Stethoscope ‘A’ (Hz) Stethoscope ‘B’ (Hz) Stethoscope ‘C’ (Hz) Stethoscope ‘D’ (Hz)
Bell mode: 20–200 Bell mode: 20–200 Bell mode: 15–200 Bell mode: 60–500
Diaphragm mode: 100–500 Diaphragm mode: 200–500 Diaphragm mode: 100–500 Diaphragm mode: 80–500
Wide mode: 50–500 Wide mode: 20–1000 Wide mode: 15–4000 Wide mode: 20–2000