Chapter 6.
Sound Settings
46
MDB Centre Frequency:
The cutoff frequency of your headphones or speakers. This is
usually given in the specification for the headphones/speakers.
MDB shape:
It is recommended that this parameter be set to 1.5 times the centre
frequency.
This is the frequency up to which harmonics are generated. Some of the lower
fundamentals near the cut-off range will have their lower harmonics cut, since
they will be below the range of the speakers. Fundamentals between the cut-off
frequency and the lower frequency will have their harmonics proportionally boosted
to compensate and restore the ‘loudness’ of these notes.
For most users, the defaults should provide an improvement in sound quality and
can be safely left as they are. For reference, the defaults Rockbox uses are:
Setting
Value
MDB Strength
50dB
MDB Harmonics
48%
MDB Centre Frequency
60Hz
MDB Shape
90Hz
The Rockbox manual
Archos Recorder