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
Tesla was talking about 3 6 9 frequencies being able to change the world, but not Solfeggio frequencies (396 hz). He was talking about so-called Solfeggio Mirror frequencies (369 hz), which heal each of your chakras.
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
"Solfeggio Mirror" frequencies are the true healing frequencies, it has something to do with how they rotate chakras (clockwise is good, counterclockwise bad) Solfeggio frequencies damage your chakras, "Solfeggio Mirror" frequencies heal.
Chakras: toes, knees, root, sacrum, solar plexus, heart, throat, mind, crown, thymus, pituitary, neo cortex
Chakra associations:
147 (1 + 4 + 7 = 12) = 3
258 (2 + 5 + 8 = 15) = 6
369 (3 + 6 + 9 = 18) = 9
471 (4 + 7 + 1 = 12) = 3
582 (5 + 8 + 2 = 15) = 6
693 (6 + 9 + 3 = 18) = 9
714 (7 + 1 + 4 = 12) = 3
825 (8 + 2 + 5 = 15) = 6
936 (9 + 3 + 6 = 18) = 9
1047 (1 + 0 + 4 + 7 = 12) = 3
1158 (1 + 1 + 5 + 8 = 15) = 6
1269 (1 + 2 + 6 + 9 = 18) = 9