Compressed audio formats such as MP3, WMA (Windows Media Audio) and MPEG-4 AAC reduce the amount of data by eliminating signal components that are hard for the human ear to hear. The “M-DAX” function generates the signals eliminated upon compression, restoring the sound to conditions near those of the original sound before compression. It also restores the original bass characteristics for a rich and expanded tonal range.



Optimized mode for compressed sources with very weak highs (64 kbps and under).


Apply suitable bass and treble boost for all compressed sources (96 kbps and under).


Optimized mode for compressed sources with normal highs (96 kbps and over).


Do not use “M-DAX”.

The M-DAX indicator lights.

This item can be set with analog signals or PCM signal (Sample Rate = 44.1/48 kHz) is input.

This item default setting for “HEOS Music” is “Low”. All others are set to “Off”.


“M-DAX” settings are stored for each input source.

This can also be set by pressing M-DAX on the main unit.

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