About Equalization
The Hartke Systems Model 2000/3500 Bass Amplifier gives you enormous con-
trol over shaping the sound of your bass, using a process called equalization.
To understand how this works, itOs important to know that every naturally occur-
ring 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. EQ controls allow you to alter a sound by boosting or attenuating
specific frequency areasN they operate much like the bass and treble controls
on your hi-fi amp, but with much greater precision. The Model 2000/3500 pro-
vides you with two different means for equalizing your bass sound:
Y Low Pass and High Pass Contour controls provide 18 dB of cut or boost in
two broad frequency bands.
Y A Graphic Equalizer provides 15 dB of cut or boost in ten narrow frequency
bands.
Normally, you will adjust the two Contour controls before Ofine-tuning� your EQ
with the Graphic Equalizer. The Low Pass Contour control affects a broad band
CONTOUR
of frequencies with 100 Hz as the center point; similarly, the High Pass Contour
00control affects a broad band of frequencies with 10 kHz as the center point.3333
5555When either is in its center detented position (O0�), it is having no effect. When it
10101010
1515 1515is moved right of center, the particular frequency area is being boosted; when it
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is moved left of center, the frequency area is being cut (Oattenuated�). Because
LOW PASSHIGH PASS
there is very little bass guitar energy at 10 kHz, the High Pass Contour control
should be thought of as your overall Onoise� controlN turning it down (to the left
Contour controls
of the O0� position) will help to eradicate hiss and buzz while having very little
effect on the bass guitar signal. Similarly, the Low Pass Contour control, when
set left of 0, can be used to eliminate rumble and Owoofiness.�
The ten-band graphic equalizer provides ten sliders, each corresponding to a
single narrow frequency band (at 30 Hz, 64 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz,
GRAPHIC EQUALIZER
30Hz64Hz125Hz250Hz500Hz1KHz2KHz3KHz5KHz8KHz2 kHz, 3 kHz, 5 kHz, and 8 kHz). This allows you to Odraw� the desired tonal
+15+12+15
IN+9response of your system. When a slider is in its center detented position (O0�),+6+3
+2
0-2it is having no effect. When it is moved above center (towards O+15�), the partic-
-3
OUT-9-6
-12ular frequency area is being boosted; when it is moved below center (towards
-15-15
30Hz64Hz125Hz250Hz500Hz1KHz2KHz3KHz5KHz8KHzO-15�), the frequency area is being attenuated. We carefully selected these
frequency areas because they have maximum impact on bass signals. For
example, the lowest slider (30 Hz) affects the very lowest audible frequencies
Graphic equalizer
(in fact, most humans cannot hear below 20 Hz), while the highest four sliders
(2, 3, 5, and 8 kHz) affects the Otwang� of a bass string.
WARNING: Use caution when raising the 30 Hz slider above 0 if you are
operating at high volume levels (especially if Compression is not being
used) since this can place undue stress on connected loudspeakers.
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ACEC
