At first I called these Kaarhuggio Frequencies, because I discovered them, and they are a variation of Solfeggio Frequencies. Then I thought it might be better if I used an existing Italian word.

Sintonizzato is an excessively long word that means tuned.

I had been listening to Solfeggio music and Frequencies, and to music tuned to A=432 Hz. Listening to either of the above is said to be healthy and healing. I soon found that 432 Hz is not one of the Solfeggio Frequencies. I wanted to do something about that.

I experimented with Solfeggio Frequencies as a sequence—a list of numbers. Using trial and error, I tried about ten Solfeggio-like sequences, none of which took me to 432 Hz.

I thought about it a little and tried a certain sequence that also didn’t include 432 Hz, but took me to 422 Hz—a lot closer than previous tries. My next sequence took me to 411 Hz. I had gone the wrong direction, so I went the other way. The next sequence hit 432 Hz exactly. I was astounded!

The process was kind of like trying to back a tractor connected to three trailers, and getting the last trailer to turn in the desired direction at just the right place. I was thrilled that I had found a process that worked, even though it was by trial and error.

“For those of you in Rio Linda”, as Rush used to say, the first nine Solfeggio Frequencies are

The conventional thinking says that 1074 Hz is the tenth Solfeggio. I disagree. But at this point, does anyone in Rio Linda care?

Probably not.

For Solfeggio aficionados, Sintonizzato Frequencies are mathematically similar to Solfeggio Frequencies, but are not the same numbers. Like Solfeggios, the digital roots of Sintonizzatos match the positions of the vertices of three equilateral triangles inscribed in a circle, dividing its circumference into nine arcs of 40° each. Each of the nine vertices is given a number, 1-9, One of the triangles has vertices at (1,4,7), another at (2,5,8), and the other at (3,6,9).

All Sintonizzato Frequency digital roots coincide with those positions on the circle. The digital roots are in triads, which correspond to the vertices of the above-mentioned triangles—
(9,3,6), (1,4,7), (2,5,8), (3,6,9), (4,7,1), (5,8,2), (6,9,3), (7,1,4) or (8,2,5).

If you take the commas out of the above Sintonizzato triads, they are the first nine Solfeggio Frequencies with the last two digits transposed. Don’t ask me why!
(936), (147), (258), (369), (471), (582), (693), (714), (825).

Whether or not the numbers are transposed, you are talking about the same three triangles.

Like Solfeggio Frequencies, Sintonizzato Frequencies are separated by 111 Hz, unless that difference does not work. Where it doesn’t work, they are separated by 21 Hz or 102 Hz. Groups of nine consecutive Sintonizzato Frequencies are separated by 211 Hz.

As in Solfeggio Frequencies, (with the exception of 1074 Hz, which might or might not be a Solfeggio, depending on how the Solfeggio sequence continues past 963 Hz)^<1>, no Sintonizzato Frequency includes a zero. [CORRECTION] no Sintonizzato Frequency includes a zero in the ones, tens or hundreds places. If you continue a Sintonizzato sequence into 5-digit frequencies, however, a zero can appear in the thousands and/or larger places.

 198,  219,  321,  432,  543,  654, 
 765,  876,  987, 1198, 1219, 1321,
1432, 1543, 1654, 1765, 1876, 1987,
2198, 2219, 2321, 2432, 2543, 2654,
2765, 2876, 2987, 3198, 3219, 3321,
3432, 3543, 3654, 3765, 3876, 3987,
4198, 4219, 4321, 4432, 4543, 4654,
4765, 4876, 4987, 5198, 5219, 5321,
5432, 5543, 5654, 5765, 5876, 5987,
6198, 6219, 6321, 6432, 6543, 6654,
6765, 6876, 6987, 7198, 7219, 7321,
7432, 7543, 7654, 7765, 7876, 7987,
8198, 8219, 8321, 8432, 8543, 8654,
8765, 8876, 8987, 9198, 9219, 9321,
9432, 9543, 9654, 9765, 9876, 9987 Hz.

As you can see, 432 Hz is there, as are 1432, 2432, 3432, 4432, 5432, 6432, 7432, 8432 and 9432 Hz.

Also, with row breaks as placed above, the last three digits of each frequency line up in columns, and these columns are made of repeating triads that are Solfeggio Frequencies. Again, don’t ask me why!
(174), (963), (852), (285), (174), (963), (396), (285), (174), and so on for the remaining nine columns.

The First 90 Sintonizzato Frequency Digital Roots

9, 3, 6, 9, 3, 6, 9, 3, 6,
1, 4, 7, 1, 4, 7, 1, 4, 7,
2, 5, 8, 2, 5, 8, 2, 5, 8,
3, 6, 9, 3, 6, 9, 3, 6, 9,
4, 7, 1, 4, 7, 1, 4, 7, 1,
5, 8, 2, 5, 8, 2, 5, 8, 2,
6, 9, 3, 6, 9, 3, 6, 9, 3,
7, 1, 4, 7, 1, 4, 7, 1, 4,
8, 2, 5, 8, 2, 5, 8, 2, 5,
9, 3, 6, 9, 3, 6, 9, 3, 6

When lined-up as above, the columns are the digits 1 to 9, repeating, but starting with 9, 3, or 6.

Simple!

What? You want more? Okay.

Do Sintonizzato Frequencies have a beneficial effect on spiritual, physical, emotional, or mental health? I don’t know. I want them to be more beneficial than Solfeggios. Why shouldn’t I? They are mathematically similar to Solfeggios, and they include 432 Hz, which is known to be better than the usual 440 Hz.

For the purpose of producing beneficial effects, I consider Sintonizzato Frequencies experimental. And I have a few thoughts about experiments.

According to Hearing Partners, “For most individuals, the highest-pitched sounds they can perceive fall within the range of 15 kHz to 17 kHz.” That’s 15,000 to 17,000 Hz. So the above 90 Sintonizzato Frequencies are within what most humans can hear. Even so, that doesn’t mean they are necessarily harmless. As with all sound waves, capacity to harm is for the most part a function of volume. Even great frequencies can be harmful if loud enough. The same page continues:

Generally, sounds at or below 70 dBA are safe for prolonged exposure. Examples of sounds within this range include:

• Quiet sounds like the rustling of leaves: 20 dBA
• Gentle rainfall: 40 dBA
• Normal conversation between people: 60 dBA
• Household vacuum cleaner: 70 dBA

Sounds become potentially harmful starting at 85 dBA and exposure must be limited to prevent hearing damage. For a sound level of 85 dBA, exposure for up to 8 hours a day is generally considered safe. However, a sound of 88 dBA is only safe for listening for a maximum of 4 hours and listening to a 91 dBA noise should be limited to 2 hours. (ibid.)

So I warn you that high frequency sounds, whether inaudible or audible, if intense enough, could physically damage you. I do not recommend being in the presence of very high volume frequencies. Rather, use frequencies that you can hear and/or feel, whose volume is comfortable for your eardrums and body. Don’t be a Guinea Pig for the testing of the effects of loud sound waves!
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Note 1. The tenth Solfeggio Frequency could be either 1074 Hz or 1174 Hz, depending on which sequence one uses.

Copyright © 2025 Michael Kaarhus