Comb Filter Null Predictor

Enter the delay time between a direct signal and a delayed copy of itself — two mics on one source, a speaker and a reflection, or a main and a slightly-late fill — and this predicts exactly which frequencies will cancel (nulls) and reinforce (peaks) when they combine. Use it to diagnose a hollow or phasey sound, or to sanity-check a delay setting before it causes a problem.

Delay time (ms) Calculate