Earbuds play a crucial role in reproducing auscultation sounds with many low-frequency (also called low-pitched, or bass) components. The following audios are for earbuds testing. This is helpful in understanding how well the earbuds reproduce the auscultation sounds or debugging some volume related issues. If you have multiple earphones, either wired or wireless, you can use them to listen to the recordings and might find some difference. Higher than normal phone volume is needed, so please try to increase the phone volume if you feel not loud. If you can't hear the sounds well at the highest phone volume, your earphones are not suitable for auscultation.

The first audio file is a single tone with 50 Hz frequency. If your earbuds can output low-frequency sounds, you can hear this tone loudly.

• single tone with a 50 Hz frequency

The second audio file is recorded heart sounds with default settings. It is loud enough when a person listen to it with good earphones at the maximum phone volume.

• Heartbeat sound recorded with Stemoscope PRO at normal volume level

The third audio file is recorded heart sounds with volume boost. It is VERY VERY loud when a person listen to it with good earphones at the maximum phone volume.

• Heartbeat sound recorded with Stemoscope PRO at maximum volume boost level

Please share your findings with us. Thank you!