Chapter 6. Sound Settings 60
quency range is. Higher Q values will affect a narrower band of frequencies, while
lower Q values will affect a wider band of frequencies.
Band 9: High shelf filter. A high shelf filter boosts or lowers all frequencies above a
certain frequency limit, much as the “treble” control found on ordinary stereo
systems does. The high shelf filter is adjusted the same way as the low shelf filter,
except that it works on the high end of the frequency spectrum rather than the
low end.
As a general guide, EQ band 0 should be used for low frequencies, EQ bands 1 through
8 should be used for mids, and EQ band 9 should be used for highs.
Enable EQ. This option controls whether the EQ is on or off.
Graphical EQ. This option brings up a graphic EQ screen, which allows adjustment of
each of the three parameters described above (gain, centre frequency, and Q) for
each of the five EQ bands.
Key Action
Right Raises the highlighted parameter.
Left Lowers the highlighted parameter.
Up Moves to the previous EQ band.
Down Moves to the next EQ band.
Select Toggles the cursor among the three pa-
rameters (gain, centre frequency, Q) for
the selected EQ band
Back Exits the graphic EQ screen.
Pre-cut. If too much positive gain is added through the graphical EQ, your music may
distort. The Precut setting allows you to apply a global negative gain to decoded
audio, cancelling out positive gain from the EQ. This will prevent distortion when
boosting certain frequency ranges, at the expense of making audio quieter.
Alternatively, precut can be used with a flat EQ curve to implement a volume cap.
For example, on a player that allows overdriving the headphone output to +6dB,
maximum volume can be capped to +0dB by applying 6dB of precut. Note that
precut is not applied if EQ is disabled.
Simple EQ. This option provides an easier alternative for those who are daunted by all
of the parameters that can be adjusted using the graphical EQ. With the Simple
EQ, the only parameter that can be adjusted is the gain.
Advanced EQ. This sub menu provides options for adjusting the same parameters as the
Graphical EQ. The only difference is that the parameters are adjusted through
textual menus rather than through a graphic interface.
The Rockbox manual (version 3.14) Sansa Fuze+
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