Start with your device volume low. Very low tones may be inaudible on phone or laptop speakers; very high tones can be uncomfortable on headphones.
What does 25 Hz sound like?
25 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 25 Hz sound wave completes 25 cycles every second, so one cycle lasts 40 ms. In air at 20 °C, where sound travels at about 343 m/s, each wave is 13.72 m (45.01 ft) long; in water it stretches to 59.24 m because sound moves about 4.3 times faster there.
Musically, 25 Hz is 35 cents above G0 (24.5 Hz) in standard A440 tuning. Doubling it to 50 Hz raises the pitch by one octave; halving it to 12.5 Hz lowers it by one.
Wavelength of 25 Hz in different materials
| Medium | Speed of sound | Wavelength |
|---|---|---|
| Air (20 °C) | 343 m/s | 13.72 m |
| Fresh water | 1,481 m/s | 59.24 m |
| Seawater | 1,500 m/s | 60.00 m |
| Helium | 1,007 m/s | 40.28 m |
| Steel | 5,960 m/s | 238.40 m |
| Glass | 5,640 m/s | 225.60 m |
Harmonics and octaves
Real instruments playing 25 Hz also produce harmonics at whole-number multiples of the fundamental. Their relative strength gives each instrument its timbre.
Which animals can hear 25 Hz?
Cannot hear it
Dogs, Cats, Horses, Sheep, Pigs, Goats, Rabbits, Rats, Mice, Gerbils, Guinea pigs, Hedgehogs, Raccoons, Opossums, Chinchillas, Bats, Beluga whales, Bottlenose dolphins, Chickens, Canaries, Budgerigars (parakeets), Cockatiels, Owls, Bullfrogs, Tree frogs, Catfish, Tuna, Greater wax moths
Frequently asked questions
What does 25 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 25 Hz?
Yes. 25 Hz is inside the typical human hearing range of 20 Hz to 20 kHz.
What musical note is 25 Hz?
25 Hz is 35 cents above G0, which is 24.5 Hz in standard A440 tuning.
What is the wavelength of 25 Hz?
About 13.72 m in air at 20 °C and 59.24 m in water.
Can dogs hear 25 Hz?
No – dogs hear roughly 67 Hz to 45,000 Hz.