Test Utilities
FFT spectrum analyzer
Live spectrum from your microphone — FFT or 1/3-octave RTA, peak hold, configurable resolution.
Point your laptop mic at a speaker and see what's actually coming out. Switch between fine FFT bins (great for spotting hum and resonance) and 31-band RTA view (industry standard for room EQ). Peak-hold paints a coral line at the recent maximum. Audio never leaves your browser — we connect mic → analyser only, nothing is recorded or uploaded.
mic off — press start to listen
View
Style
zoom
settings
Smoothing50%
Peak hold30 dB/s
how to use
- ▸ Use RTA mode for room EQ — match the curve to your target by ear or with a reference mic.
- ▸ Use FFT mode to find specific resonances, hum frequencies (50 / 60 Hz), or distortion artifacts.
- ▸ The browser's mic chain is not calibrated. Treat this as relative, not absolute SPL.
- ▸ No audio leaves your browser. We connect mic → analyser only; nothing is recorded or uploaded.
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