Sintonizzato-Quarto Frequencies (Sintonizzato-Q) are a variation of Solfeggio Frequencies. 528 Hz is a Solfeggio Frequency, famous for its beneficial effects. But it is the sixteenth harmonic of 33 Hz. I call this variation “Quarto” because it includes the fourth harmonic of 33 Hz, which is as low an harmonic of 33 Hz as a Solfeggio variation can go.

Sintonizzato-Quarto is Italian for Tuned-Fourth.

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

Sintonizzato-Q 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-Q 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. They are—
(6,9,3), (7,1,4), (8,2,5), (9,3,6), (5,8,2), (1,4,7), (2,5,8), (3,6,9), (4,7,1), (5,8,2), (6,9,3).

If you take the commas out of the above Sintonizzato-Q triads, they are the first nine Solfeggio Frequencies with either the first two or the last two digits transposed.
(693), (714), (825), (936), (582), (147), (258), (369), (471), (582), (693).

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

Like Solfeggio Frequencies, Sintonizzato-Q Frequencies are separated by 111 Hz, unless that difference does not work. Where it doesn’t work, they are separated by 21 Hz, 102 Hz or 211 Hz. Groups of nine consecutive Sintonizzato-Q 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 or higher frequencies, however, a zero can appear in the thousands and/or larger places.

The First 90 Sintonizzato-Q Frequencies

 132,  243,  354,  465,  576,  687,
 798,  819,  921, 1132, 1243, 1354,
1465, 1576, 1687, 1798, 1819, 1921,
2132, 2243, 2354, 2465, 2576, 2687,
2798, 2819, 2921, 3132, 3243, 3354,
3465, 3576, 3687, 3798, 3819, 3921,
4132, 4243, 4354, 4465, 4576, 4687,
4798, 4819, 4921, 5132, 5243, 5354,
5465, 5576, 5687, 5798, 5819, 5921,
6132, 6243, 6354, 6465, 6576, 6687,
6798, 6819, 6921, 7132, 7243, 7354,
7465, 7576, 7687, 7798, 7819, 7921,
8132, 8243, 8354, 8465, 8576, 8687,
8798, 8819, 8921, 9132, 9243, 9354,
9465, 9576, 9687, 9798, 9819, 9921 Hz.

As you can see, they start at 132 Hz, which is the fourth harmonic of 33 Hz. 528 Hz, which is the sixteenth harmonic of 33 Hz, is not in this set.

Also, with row breaks as placed above, the last three digits of each frequency line up in columns. These columns are made of repeating Solfeggio Frequencies. Don’t ask me why!
(174), (396), (285), (417), (528), etcetera

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,
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

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

Simple! Fundamental!

Do Sintonizzato-Q 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 simple and fundamental.

For the purpose of producing beneficial effects, I consider Sintonizzato-Q Frequencies experimental. I will spare you my previously-expressed thoughts about experiments.
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Note 1. In my opinion, the tenth Solfeggio Frequency is 1174 Hz. [CORRECTION] The tenth Solfeggio Frequency could be either 1074 Hz or 1174 Hz, depending on which sequence one uses. But this article is not primarily about Solfeggios.

Copyright © 2025 Michael Kaarhus