4000 Hz sine tone to test your speakers or headphones.

Humans can detect sounds in a frequency range from about 18 Hz to 20 kHz. (Human infants can actually hear frequencies slightly higher than 20 kHz, but lose some high-frequency sensitivity as they mature); the upper limit in average adults is often closer to 15–17 kHz. If you “hear” frequencies lower than 18 Hz, you might just be hearing harmonic distortion.
If you can´t hear the tone in this Video, this might be because of your listening device.

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If you have any suggestions for future videos, please let me know in the comments below :-)

▬ Test Tone Playlist ▬▬▬▬▬▬▬▬▬▬
[ Ссылка ]

▬ Image source ▬▬▬▬▬▬▬▬▬▬▬▬
[ Ссылка ] "Sinus Frequenz" von geralt
Lizenz: CC0 Creative Commons

DISCLAIMER: Loud sounds can potentially damage your hearing. When playing one of our videos, if you feel uncomfortable, the sound may be too loud for your ears. Please do not place speakers right next to a person’s ears. If you have difficulty hearing or hear ringing in your ears, please immediately turn the volume down or discontinue listening to the sounds and consult an appropriate professional. If you have significant difficulty sleeping on a regular basis, or feel tired during the day, please consult an appropriate professional. The sounds provided by this Youtube channel are for entertainment purposes only.

Thanks for watching!

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