Manual Hartke HD75 (page 10 of 12) (English)

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The Hartke Systems HD Series Bass Ampliﬁer gives you control over shaping the sound

of your bass, using a process called equalization. To understand how this works, it’s

important to know that every naturally occurring sound consists of a broad range of

pitches, or frequencies, combined together in a unique way. This blend is what gives

every sound its distinctive tonal color. The HD Series 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 HD75 and HD150 offer three bands of equalization. Each EQ knob, labeled Bass,

Mid, and Treble, affects a different frequency area of the audio. We carefully selected

these frequency areas because they have maximum impact on bass guitar signals. The

Bass and Treble controls are shelving EQs, which provide boost when the control is

moved clockwise from the center or cut when the control is moved counterclockwise

from the center. The Mid EQ control is a passive, cut-only, circuit designed to provide a

response that is ﬂat to a mid-scoop.

The seven-band graphic equalizer provides seven sliders, each corresponding to a single

narrow frequency band. This allows you to “draw” the desired tonal response of your

system. When a slider is in its 0, center detent position, it has no effect to the audio

signal. When it is moved above center (towards +12), the particular frequency area is

being boosted; when it is moved below center (towards -15), the frequency area is being

attenuated.

In many instances, the best way to deal with equalization is to think in terms of which

frequency areas you need to attenuate, as opposed to which ones you need to boost. Be

aware that boosting a frequency area also has the effect of boosting the overall signal;

speciﬁcally, too much Low EQ boost can actually cause overload distortion or even harm

the connected speaker.

The speciﬁc EQ you will apply to your bass signal is very much dependent upon your

particular instrument and personal taste and playing style.

However, here are a few general suggestions:

For reggae or Motown sound, boost the Bass EQ slightly while attenuating the Treble EQ.

To remove boxiness and make your instrument sound more “hi-ﬁ,” attenuate the Mid EQ

control.

For a twangy sound that cuts, try boosting the Treble and slighting rolling off the Bass

EQ control.

As you experiment with the EQ controls of the HD Series, don’t forget that your bass

also provides signiﬁcant EQ control in the form of its pickup and tonal settings—this

can be particularly effective in instruments that have active circuitry.

Using Equalization

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Hartke HD75 Manual

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