Full 20–20k sweeps drawn as frozen lines with octave-ish grid and band shading for easier reading.
Mic idle.
Sweep idle.
Input & Display
AudioContext: –
0 dB
Input Level (VU)
– dB
QuietWorkingHot
Workflow:
1) Start mic, aim it, set level (use a real mic close to the box).
2) Full Sweep Capture on a good box → grey line.
3) Optional: save/load JSON.
4) Swap box, Compare Sweep → bright line + ΔdB difference.