The 40 Hz frequency is categorized under Brainwaves. It is known for: High-level information processing, problem-solving, and conscious perception. Also: A significant bass frequency, good for assessing the impact and presence of low-end audio..

Our free online tone generator allows you to play this 40 Hz frequency instantly. Use the controls above to adjust the volume or switch waveforms (sine, square, sawtooth, triangle) to hear the different timbres.