Load a reference and one or more audio files to compare to automatically perform a null test, measure the difference in dB LUFS, dB rms, dB peak, ESR, MAE, MSE, MRSTFT, and produce a spectrum analysis of the residual.

You can also download the delta audio file and a png image with the results of each comparison.

This script autmoatically matches the loudness and time-aligns the two files using cross-correlation (with a precision of 0.000001 samples) and then inverts the polarity on one if necessary.

Even though the files don't need to be aligned manually before the upload, they must be within 1000 samples from each other, otherwise the auto-alingment won't work correctly.

Please put a link to this page if you share your null test results on youtube videos, social media, forums, etc., thanks.