About the 50 Hz tone
50 Hz is the frequency of mains electricity in most of the world outside the Americas, so it's the hum you hear from transformers, fluorescent lights and poorly shielded audio cables. Playing it can help you identify whether a buzz in your setup is electrical.
A 50 Hz sine wave completes 50 cycles every second; each cycle lasts 20.000 ms, and the sound wave is about 686.0 cm long in air. The nearest musical note is G1.
Start with the volume low and raise it slowly. Use the slider to move away from 50 Hz, or try another preset: 20 Hz · 40 Hz · 60 Hz · 100 Hz · 256 Hz · 432 Hz · 440 Hz · 528 Hz · 1,000 Hz · 8,000 Hz · 15,000 Hz · 17,400 Hz · 20,000 Hz.
Questions
How do I play a 50 Hz tone?
Press Play above. The generator starts at exactly 50 Hz as a pure sine wave; you can change the wave shape and volume.
Why can't I hear 50 Hz?
Your speakers or headphones may not reproduce it, the volume may be too low, or it may be outside your hearing range. Very low and very high tones are the hardest.
Is it safe to listen to test tones?
At a comfortable volume, yes. Start quiet, and stop if anything feels uncomfortable.
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