Tuning fork intervals: why two forks, not one
In Acutonics, work is almost never done with a single tuning fork. The school's claim is that the effect comes not from a tone but from the distance between two tones — the interval. Below are all thirteen classic pairs, with exact frequency ratios and what you actually hear.
The frequency ratios and the “what you hear” column are computed from the frequencies themselves.
The meaning of an interval is the school's tradition: it has not been measured or tested.
The main surprise in this table
People often write about Acutonics intervals that “two frequencies create a beat, and the beat is what works”. Look at the last column: exactly one pair out of thirteen produces a pulsation — Om with Mars. All the others sound as a consonance: the difference between their frequencies is too large.
The reason lies not in the tuning forks but in how hearing works. The ear is not a single microphone but a set of filters, each covering a band of its own. You hear a pulsation when both tones fall into ONE filter and the brain receives a single fluctuating signal from it. Around 140 Hz a filter is about 40 Hz wide — which is why a pair 4 Hz apart pulses, while the famous fourth of Om and Jupiter (a difference of 47.5 Hz) never pulses, however closely you listen.
Hence a practical conclusion worth keeping in mind: wide intervals and close pairs are two different tools. The first give harmony and “fullness”, the second give rhythm. Both are needed, but one cannot stand in for the other.
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Why the ratios are “almost” pure
In music, a fifth is the ratio 3:2, that is exactly 1.5. The “New Moon fifth” comes out at 1.546 — that is 754 cents, almost halfway between a fifth and a minor sixth. The pair is called a fifth because of its notes: C# and G# really are a fifth apart, but the Om tone lies below its note and the New Moon tone above its own. Every interval in the set misses its name, and the reason is simple: the frequencies come from orbits, and orbits know nothing about musical tuning. A match would take a miracle.
You hear this as a slight tremor inside the consonance — the more noticeable, the further the ratio is from pure. The only pair that lands almost exactly is the Sun with the Moon: 1.667 against the ideal 5/3 = 1.6667. A beautiful coincidence, and nothing more.
A sixth, not a fifth
Online, the pair of Om and Venus is constantly called a fifth. That is a mistake, and it is easy to check: 221.23 ÷ 136.10 = 1.626, while a fifth is about 1.5. A ratio of 1.626 is a sixth. The mistake is so common that the main reference this section is built from corrects it in a line of its own.
A small thing, but a telling one: the numbers in this subject can almost always be checked, and almost nobody checks them.
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