How do I remove 60 hz square tone?

Audacity 3 Help Forum Windows
1

Hi, Can you show a tutorial of how to remove 60 hz square tone on Audacity?
Version: Audacity 3.7.3
OS: Windows 11

2

Same as your other question about a sawtooth except there are only odd harmonics.

3

Quick-fix for a 60 Hz square-wave hum in Audacity 3.7.3 (Windows 11)

  1. Save a copy of the project first.
    2.Select the whole track (Ctrl +A).
  2. Open Effect ▸ EQ & Filters ▸ Notch Filter.
  • Run it at 60 Hz, Q≈10, –30 dB.
  • Press Ctrl + R to repeat, changing only the frequency to 180, 300, 420 Hz (odd harmonics).
  1. (Faster one-pass option) Use Filter Curve EQ instead, pulling down those same frequencies by ~30 dB.
  2. If a faint buzz remains, grab a short sample of only the hum and run Effect ▸ Noise Reduction (6 dB / 6 / 3 bands).
  3. Play back and compare—hum should be gone without harming the rest of the audio.