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Input & Measurement

Calibration

How to calibrate: feed a steady, known level (an SPL calibrator, a reference meter next to this mic, or your monitor controller's calibrated pink-noise level), type that value in the field above while measuring, then press Set. The app computes the offset so the reading matches your reference.

A computer mic reads relative level (dBFS); the offset maps it to absolute dB SPL. Browser auto-gain, noise suppression and echo cancellation are turned off so the input stays raw — keep input gain fixed after calibrating, or the calibration drifts. Built-in laptop mics are fine for tracking changes but are not lab-grade; for accuracy use an external measurement mic.