Bell and Diaphragm Modes

To Alternate between Bell and Diaphragm Modes, click the key:

Diaphragm Mode - provides frequency response suited to valve and breath sounds. Diaphragm Mode will remove low frequencies, making it easier to discern higher frequencies that may be masked by the louder low frequencies.

Bell Mode - provides boosting of very low frequencies to facilitate listening to heart murmurs. Due to the substantial low frequency energy in some heart sounds, Bell Mode has significantly higher signal power than Diaphragm Mode. The choice of Mode for any given diagnostic situation is a matter of listener preference, and alternating between modes helps to discern the nuances of body sounds.