Hartke KM100 Manuel Du Propriétaire page 14

About Equalization
The Hartke KM60 or KM100 Keyboard amplifier gives you
enormous control over shaping the sound of your keyboard
rig, using a process called equalization. To understand how
this works, it's important to know that every naturally occur-
ring sound consists of a broad range of pitches, or frequen-
cies, combined together in a unique way. This blend is what
gives every sound its distinctive tonal color. EQ controls
allow you to alter a sound by boosting or attenuating specific
frequency areas—they operate much like the bass and treble
controls on your hi-fi amp, but with much greater precision.
The KM60 or KM100 provides you with one most effective
tool for shaping the overall tone of your Keyboard sound; a
Graphic Equalizer providing 12 dB of cut or boost in seven
narrow frequency bands.
The seven-band graphic equalizer provides seven sliders,
each corresponding to a single narrow frequency band (100
Hz, 250 Hz, 500 Hz, 1 kHz, 2.5 kHz, 5 kHz, and 10 kHz). This
allows you to "draw" the desired tonal response of your sys-
tem. When a slider is in its center position ("0"), it is having
no effect. When it is moved above center (towards "+12"),
the particular frequency area is being boosted; when it is
moved below center (towards "-12"), the frequency area is
being attenuated. We carefully selected these frequency areas
because they have maximum impact on keyboard signals.
For example, the lowest slider (100 Hz) affects the very lowest
audible frequencies (in fact, most humans cannot hear below
20 Hz), while the highest four sliders affects the mid-range
and high frequencies.
To find out how each graphic equalizer slider affects the
sound of your particular keyboard, start with all seven bands
flat (that is, all seven sliders at their "0" center position).
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