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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