There is bass rolloff in the mic even when set flat. This is the proximity filter designed to correct for the way the mic responds when it is close to a source.

There is bass rolloff in the mic even when set flat. This is the proximity filter designed to correct for the way the mic responds when it is close to a source. https://en.wikipedia.org/wiki/Proximity_effect_(audio) https://en.wikipedia.org/wiki/Proximity_effect_(audio)