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USING THE EQUALIZER CONTROLS
The graphic equalizer divides the music source
into a number of
frequency bands and boosts or attenuates the level at each of the
frequencies, enabling much finer sound quality adjustments than
ordinary tone controls and sound field compensation.
Some examples of operation are given below.
[Amplitude of change in frequency
(3B)
sresponse
using ordinary tone con-
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trol
i t
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Levet
Level
——-m
Frequency
inge in frequency |
response using graphic equalizer
L_ controls
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[1] COMPENSATING
FOR THE PLAYBACK
FREQUENCY RESPONSE
The
frequency
response
of a phono-cartridge
or speaker
has
peaks and dips in the high range and low range. It can be made
flat by adjusting finely the controls on the graphic equalizer.
——.-=
Level
Compensated ee
Overall frequency
response
Frequency
—_—
2] IMPROVING
THE
ACOUSTICS
OF
THE
LISTENING ROOM
The ideal listening room is one where the transmission frequency
response
is flat. in actual
fact,
however,
the acoustics
vary
2
depending on the effects of the structure of the room and its fur-
niture, and on the listening position.
12
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Although there is minimal treble attenuation in a listening room
surrounded by hard walls and windows and having a bare floor,
the bass sounds are reflected to a great extent.
in rooms like these, turn up the 150 Hz control sfightly.
in a room surrounded
by drapes and with carpets on the floor,
there is minimal reflection of the sound and both the bass and the
treble are absorbed,
in rooms like these, turn up the 60 Hz control slightly and turn up
the frequency controls above 2.4 kHz graduaily.
The above examples are extremely general.
The acoustics undergoes a change in accordance with the fur-
niture in the listening room, the height of the ceiling and the listen-
ing position, among other factors.
Play the music and try operating each of the controls to produce
the best effect.
[3] COLORING THE REPRODUCED SOUND
All instruments
and vocals
have their own
frequency
band,
as
shown in the figure.
By moving
the
controls
up
or down,
the
volume
of the
in-
struments preferred can be boosted or other instruments can be
attenuated.
For instance, it is possible to boost the 60 Hz frequency and give
the bass drum a greater "punch" or boost the 1 kHz frequency
and position the vocals st the front. When the 6 kHz frequency is
boosted, the cymbals and "high hat" sound much clearer.
Instruments and vocals have a great many harmonic components
along with the fundamental frequency band and so you can have
lots of fun operating the 7 controls to achieve the sound of your
choice.
NOTE:
In order to protect the speakers from damage resulting from
power
overload,
do
not
excessively
increase
the
stereo
amplifier's volume level when boosting the treble range on this
unit.
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~———=~ Frequency (Hz)
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