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What does 51 Hz sound like?
51 Hz is a sub-bass frequency. It is a very deep sub-bass tone that you feel in your chest as much as hear. Small speakers struggle to reproduce it; good headphones or a subwoofer will.
A 51 Hz sound wave completes 51 cycles every second, so one cycle lasts 19.6 ms. In air at 20 °C, where sound travels at about 343 m/s, each wave is 6.73 m (22.07 ft) long; in water it stretches to 29.04 m because sound moves about 4.3 times faster there.
Musically, 51 Hz is 31 cents below G♯1 (51.91 Hz) in standard A440 tuning. Doubling it to 102 Hz raises the pitch by one octave; halving it to 25.5 Hz lowers it by one.
Wavelength of 51 Hz in different materials
| Medium | Speed of sound | Wavelength |
|---|---|---|
| Air (20 °C) | 343 m/s | 6.73 m |
| Fresh water | 1,481 m/s | 29.04 m |
| Seawater | 1,500 m/s | 29.41 m |
| Helium | 1,007 m/s | 19.75 m |
| Steel | 5,960 m/s | 116.86 m |
| Glass | 5,640 m/s | 110.59 m |
Harmonics and octaves
Real instruments playing 51 Hz also produce harmonics at whole-number multiples of the fundamental. Their relative strength gives each instrument its timbre.
Which animals can hear 51 Hz?
Cannot hear it
Dogs, Horses, Sheep, Goats, Rabbits, Rats, Mice, Gerbils, Guinea pigs, Hedgehogs, Raccoons, Opossums, Chinchillas, Bats, Beluga whales, Bottlenose dolphins, Chickens, Canaries, Budgerigars (parakeets), Cockatiels, Owls, Bullfrogs, Greater wax moths
Instruments and voices that can play 51 Hz
Frequently asked questions
What does 51 Hz sound like?
It is a very deep sub-bass tone that you feel in your chest as much as hear. Small speakers struggle to reproduce it; good headphones or a subwoofer will.
Can humans hear 51 Hz?
Yes. 51 Hz is inside the typical human hearing range of 20 Hz to 20 kHz.
What musical note is 51 Hz?
51 Hz is 31 cents below G♯1, which is 51.91 Hz in standard A440 tuning.
What is the wavelength of 51 Hz?
About 6.73 m in air at 20 °C and 29.04 m in water.
Can dogs hear 51 Hz?
No – dogs hear roughly 67 Hz to 45,000 Hz.