Spectrum analyzerReal-time FFT with peak hold and waterfall

Pick a source above to start: your microphone, an audio file, or the built-in test signal.

Peak–

Note–

Peak level–

Signal (RMS)–

Resolution–

Display Band width FFT size Smoothing 0.70 Frequency axis Top of scale Range Peak hold Waterfall

Drag across the display to read any frequency. Levels are in dBFS (0 dB is digital full scale), so they show relative loudness, not calibrated sound pressure.