528 hz is one of the solfeggio frequencies.
Some believe that the true healing frequencies are not solfeggio, but solfeggio mirror.
https://satorirei.com/2016/10/26/the-vampiric-solfeggio-the-real-healing-frequencies-3-6-9/
Chakra frequencies: 369 hz - Base, 471 hz - Sacrum, 582 hz - Solar Plexus, 693 hz - Heart, 714 hz - Throat, 825 hz - Third Eye, 936 hz - Crown
“If you only knew the magnificence of the 3, 6 and 9, then you would have the key to the universe.”
https://satorirei.com/2016/10/26/the-vampiric-solfeggio-the-real-healing-frequencies-3-6-9/
369 hz - root chakra, 471 hz - sacral chakra, 582 hz - solar plexus chakra, 693 hz - heart chakra, 714 hz - throat chakra, 825 hz - third eye chakra, 936 hz - crown chakra
These sounds heal your body.
I believe Tesla was talking about 3 6 9 "Solfeggio Mirror" frequencies (literally 369 hz), but not Solfeggio frequencies (396 hz).
Solfeggio: 174 hz, 285 hz, 396 hz, 417 hz, 528 hz, 639 hz, 741 hz, 852 hz, 963 hz
"Solfeggio Mirror": 147 hz, 258 hz, 369 hz, 471 hz, 582 hz, 693 hz, 714 hz, 825 hz, 936 hz, 1047 hz, 1158 hz, 1269 hz
In vortex mathematics, the numbers 3 6 and 9 produce a clockwise turning vortex, whereas the numbers 3 9 and 6 produce an anticlockwise turning vortex.
This somehow means that these frequencies can force your chakras to rotate in either a clockwise or anticlockwise direction. I believe anticlockwise could be harmful and clockwise is the correct way.
Chakras: toes, knees, root, sacrum, solar plexus, heart, throat, mind, crown, thymus, pituitary, neo cortex
Chakra associations:
toes = 147 hz (1 + 4 + 7 = 12) = 3
knees = 258 hz (2 + 5 + 8 = 15) = 6
root = 369 hz (3 + 6 + 9 = 18) = 9
sacrum = 471 hz (4 + 7 + 1 = 12) = 3
solar plexus = 582 hz (5 + 8 + 2 = 15) = 6
heart = 693 hz (6 + 9 + 3 = 18) = 9
throat = 714 hz (7 + 1 + 4 = 12) = 3
mind = 825 hz (8 + 2 + 5 = 15) = 6
crown = 936 hz (9 + 3 + 6 = 18) = 9
thymus = 1047 hz (1 + 0 + 4 + 7 = 12) = 3
pituitary = 1158 hz (1 + 1 + 5 + 8 = 15) = 6
neo cortex = 1269 hz (1 + 2 + 6 + 9 = 18) = 9
https://web.archive.org/web/20230317135229/https://satorirei.com/2016/10/26/the-vampiric-solfeggio-the-real-healing-frequencies-3-6-9/
"If you only knew the magnificence of the 3, 6 and 9, then you would have the key to the universe." - Nikola Tesla
Chakra frequencies: 369 Hz - Root, 471 Hz - Sacrum, 582 Hz - Solar Plexus, 693 Hz - Heart, 714 Hz - Throat, 825 Hz - Third Eye, 936 Hz - Crown