Alto Professional Live Drive App - Manual (Page 15)

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Tap the button next to your desired setting:
Flat (loudspeakers only): There will
be no change to the audio.
Contour (loudspeakers only):
Boosted bass and treble with a
gradual cut of mid-range frequencies.
This may be a useful setting for program
material with less-than-desirable bass and high-
frequency levels.
80Hz HP (loudspeakers only):
Applies a high-pass filter. This is
useful when using a Black Series loudspeaker
as a crossover with a subwoofer that does not
have a high-pass output. This setting is also
useful for cutting all bass frequencies (e.g., for
applications with speech only, or when used as
a delay or fill loudspeaker where the extra bass
frequencies are not needed).
Ext LF (loudspeakers only): Extends
the low-frequency response of the
loudspeaker, providing increased output of bass
frequencies.