Pure Frequencies Clean sine, any Hz
Single-frequency sine tones at exactly the Hz you want. 432 Hz, 528 Hz, 40 Hz, all nine solfeggio. No beating, no modulation: the simplest audio signal possible.
What Are Pure Frequencies?
Pure frequencies are single sine-wave tones played at a precise, unchanging frequency. They're the simplest possible audio signal: no beating, no pulsing, no modulation. Just one tone, held steady, at whatever Hz you choose.
That simplicity is their strength. Pure tones are used in research laboratories, hearing tests, scientific entrainment experiments, and traditional meditation practices where the purity of the sound matters more than entrainment effect. If you want to listen to exactly 432 Hz (or 528 Hz, or 40 Hz) without any beating pattern or combined carriers, pure frequencies are what you need.
When to Use Pure Tones Instead
Pure tones fill specific needs that beat-based entrainment can't. For chakra meditation practices that associate specific frequencies with specific energy centers, the beat pattern is a distraction; the pure tone is the point. For researchers testing a hypothesis about 40 Hz gamma entrainment, a clean sine wave removes confounding variables.
Pure tones are also the closest audio analog to the singing-bowl tradition. A singing bowl played at resonance produces a tone that's close to pure: one dominant frequency with small harmonics. Digital pure tones remove the harmonics entirely, giving you the cleanest possible signal at the frequency you want.
Arkhitec's 27 Solfeggio and Pure Presets
Arkhitec includes 27 presets in the combined solfeggio and pure-frequency category. All nine classical solfeggio frequencies (174, 285, 396, 417, 528, 639, 741, 852, 963 Hz) are available as both clean pure tones and as solfeggio presets layered into soundscapes. Plus pure sine presets at 40 Hz (gamma entrainment research), 432 Hz (alternative tuning), and other research-grade frequencies.
For the cleanest possible signal, use the pure tone presets without layering. For a richer experience, stack a pure tone beneath singing bowls, rain, or ambient audio in the 7-layer mixer. Save the combinations you like as custom presets. If what you want is 528 Hz with nothing else on it, pure frequencies give you the signal you asked for — nothing more, nothing less.
Quick facts
The cleanest signal, the most flexibility
One frequency, nothing on top of it.
Cleanest Possible Signal
Pure sine waves: no beating, no modulation, no harmonics. The simplest audio signal that can be produced.
40 Hz Gamma Research Tone
Pure 40 Hz sine wave, sitting in the gamma band. Use it clean, or under a white-noise floor for long work sessions.
Layer or Play Clean
Every pure tone works solo for traditional practice or layered beneath singing bowls, rain, or ambient audio for a richer sound.
All Nine Solfeggio
174, 285, 396, 417, 528, 639, 741, 852, 963 Hz: every solfeggio frequency as a clean pure tone.
Explore more
See how each band fits into the stacks you build.
Solfeggio Frequencies
The nine classical frequencies, layered into soundscapes.
02Binaural Beats
When you want entrainment, not a pure tone.
03Isochronic Tones
Pulsed tones with strong entrainment signal.
04Frequency Meditation
Where pure tones fit in a meditation practice.
05Alpha Waves
The brainwave band pure tones are often used to target.
06Free Frequency Generator
Try a pure tone in your browser right now.
Frequently Asked Questions
Pure frequencies: when you need a clean signal, not an entrainment pulse.
What's the difference between a pure tone and a binaural beat?
What is 432 Hz?
What is 40 Hz used for?
Do pure tones entrain the brain like binaural beats?
Can I combine pure tones with other Arkhitec features?
Clean tones, precise frequencies.
Download Arkhitec and listen to exactly the frequency you want, nothing more and nothing less.
Arkhitec is an audio tool, not a medical device, and nothing here is a substitute for professional care. If you have epilepsy or a seizure disorder, check with your doctor before using brainwave entrainment audio, and don't play sleep or deep-relaxation audio while driving.