Three simple steps
How to analyze an audio frequency spectrum
- 01
Choose a browser-supported audio file from your device. The file stays local.
- 02
ToolYogi samples multiple sections across the track and calculates an averaged frequency spectrum.
- 03
Read the spectrum graph, dominant frequency, spectral centroid and low, mid and high energy balance while previewing the audio.
What does a spectrum analyzer show?
A spectrum analyzer shows how much energy an audio signal contains at different frequencies. Lower frequencies represent bass, the middle range contains much of the musical body and speech information, and higher frequencies contain brightness, detail and air.
What is dominant frequency?
The dominant frequency is the strongest FFT bin found in the averaged analysis. In a full mix it does not necessarily equal the musical note or key because drums, bass, vocals and instruments all contribute energy.
What is spectral centroid?
Spectral centroid is a weighted center of the spectrum. Higher values often correspond to a brighter spectral balance, while lower values can indicate a darker or bass-heavier balance. It is a descriptive measurement, not a quality score.
Why does ToolYogi average multiple sections?
A whole song changes over time. Sampling multiple windows across the file gives a broader overview than measuring only the first few seconds, while remaining fast enough to run locally in a browser.
Can this tell me whether my mix is good?
No single spectrum shape defines a good mix. Genre, arrangement, instruments and artistic intent all change the expected balance. Use the graph as diagnostic information alongside listening and reference tracks.
Does ToolYogi upload my audio?
No. Audio decoding, FFT calculation and visualization run locally in your browser. The selected file and result are not uploaded or stored by ToolYogi.
A little more clarity
Frequently asked questions
Is the Spectrum Analyzer free?
Yes. The current browser-based frequency analyzer works without an account.
What frequency range is analyzed?
The graph covers approximately 20 Hz to 20 kHz, limited by the audio file's sample rate and Nyquist frequency.
Is this a real-time spectrum analyzer?
No. This version analyzes multiple windows from the selected file and displays an averaged spectrum. It is designed for quick file analysis rather than live microphone or playback monitoring.
Can I use it for mastering?
It can help you inspect tonal balance, but mastering decisions should also consider loudness, dynamics, stereo behavior, genre and listening context.
Is my file stored?
No. The selected audio and analysis stay in the browser session.