Isochronic tones are a single tone whose volume rises and falls at a fixed rate: ten times a second makes a 10 Hz pulse. They are easily confused with binaural beats and monaural beats. Here, three of this channel’s own tracks are measured the same way to show, in numbers, how the three actually differ.
The three types, measured on our own tracks
The method was identical for all three: take about 60 seconds of the master and measure how deeply the level swings at the stated rate (7.83 Hz, 2 Hz, 10 Hz) in the left channel alone, the right channel alone, and both mixed (close to what speakers produce).
| Type | Our track | How it is made | Swing per ear (measured) | Speakers | Headphones |
|---|---|---|---|---|---|
| Isochronic (pulse) | 7.83Hz | One tone whose volume rises and falls regularly | Same in both ears | In the band small speakers play: ±12.4% | No |
| Binaural | 174 / 176Hz | Slightly different tones sent separately to each ear | Left ±0.6%, right ±0.6% (no swing per ear) | Mixed: ±65.4% | Yes |
| Monaural | 174Hz・10Hz | The swing is built into the sound; both ears get the same signal | Left ±66.7%, right ±66.7% | ±66.7% | No |
- Isochronic: the swing is in the sound itself and reaches both ears the same way. No headphones needed. Our 7.83 Hz track pulses very shallowly over a low tone; measured in the band small speakers can play, the swing is about ±12% (the first version did not get this far; see the production note).
- Binaural: each ear receives only a steady tone; the swing exists only as the difference between the ears, which is why headphones are needed. On speakers the two sides mix in the air and the swing appears as an ordinary beat (see the triple-stack rebuild).
- Monaural: the swing is built into the sound and the same signal goes to both ears. Both ears show the same depth; no headphones needed.
Isochronic and monaural belong together in one respect: the sound itself swings. They differ in how: an isochronic tone is one tone made louder and softer on a schedule, while a monaural beat mixes two close tones so that they beat (this channel’s focus series is described as monaural).
How the pulse is shaped
Isochronic pulses vary. Some switch the tone fully off between pulses, which makes the rhythm very clear but can become tiring over a long session. Others never go silent and only lift the level slightly. Our 7.83 Hz track is meant for sleep, so it uses a shallow swing that never drops to silence.
What research says
Whether brainwaves follow rhythmic sound has been studied mainly with binaural beats, and the results are mixed (the research status is summarized in our binaural beats guide). Peer-reviewed studies focused on isochronic tones alone are, as far as we could verify, few. This article checks how the sounds are built; it does not address what they do to a listener.
Listening tips
- Isochronic and monaural tones work on speakers. Binaural beats need headphones.
- Start quietly. Rhythmic pulses become intrusive when loud.
- If you hear a regular pulsing with only one earbud in, the track is isochronic or monaural.
- This article does not promise any physical or mental effect. If you have health concerns, please see a doctor.
Frequently asked questions
Do isochronic tones need headphones?
No. The swing is in the sound itself, so speakers deliver it just as well.
Isochronic or binaural?
It depends on how you listen. If headphones are not an option, isochronic or monaural is the practical choice.
What pulse rates are common?
Rates from a few hertz to a few tens of hertz, named after EEG bands. A link between the rate and any effect on the body has not been established.
How is this different from monaural beats?
One makes the swing by changing a single tone’s volume; the other by mixing two tones. More in Monaural beats.
This article does not guarantee any medical or health benefit and is not a substitute for professional medical care. If you have any health concerns, please consult a physician or other qualified professional.
