How it works: Spectral energy is integrated across two bands: the Chest zone (100–800 Hz) covering the fundamental and lower formants (F1/F2), and the Resonance zone (2–10 kHz) where the Singer's Formant around 3 kHz and upper harmonics cluster (referred to as SF). The meter shows SF / Chest (dB) = 10 · log₁₀(SF power / Chest power). −15 dB is the balanced center; values above −10 dB indicate brilliance / Singer's Formant-dominant tone; values below −20 dB indicate warm / chest-dominant tone. The Noise Floor (dB) setting acts as a noise gate — bins below the threshold are excluded from both band calculations.

What is Singer's Formant?

The Singer's Formant (SF) is a concentration of acoustic energy between 2 and 4 kHz, produced when a trained singer clusters their third, fourth, and fifth vocal formants. It allows the voice to cut through an orchestra without amplification. This analyzer measures the ratio of SF energy (2–10 kHz) to chest energy (100–800 Hz) in real time, giving a precise dB readout of how much resonance the voice carries relative to its fundamental strength.

How to use Harmonics Analyzer Simple

Click Start Microphone and sing or speak into your mic. The Arc Meter shows your SF / Chest ratio in real time — the center (−15 dB) is balanced resonance, right of center indicates a bright Singer's Formant-dominant tone, and left of center indicates a warm, chest-dominant voice. The LED Meter gives the same reading as a 21-column bar for quick visual reference. Adjust the Noise Floor to filter out ambient noise. For spectrum visualisation, pitch detection, vibrato analysis, and session statistics, upgrade to Pro.

Arc Meter and LED Meter

The Arc Meter displays the SF / Chest ratio as a large sweeping arc with colour zones — blue for chest-dominant, green for balanced, and amber for brilliance-dominant. The current dB value plus chest and SF band power readings are shown numerically below the arc. The LED Meter renders the same ratio as a horizontal 21-column bar: warm tones light up the left columns, bright tones light up the right. Both meters update continuously in real time.

Frequency bands explained

The Chest zone (100–800 Hz) covers the fundamental frequency and the first two formants (F1/F2), which determine vowel quality and the basic fullness of the voice. The Singer's Formant zone (2–10 kHz) captures the upper formant cluster (F3–F5) responsible for vocal brilliance and projection. The Floor (dB) setting acts as a noise gate — frequency bins below the threshold are excluded from both band calculations to prevent room noise from skewing the ratio.

Harmonics Analyzer

Harmonics Meter

Harmonics LED Meter