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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
(dB)
response using ordinary tone con-
trols
+10
TREBLE
{
——~
Level
1 ob of
om
& Nh
10
100
1k
10k
(Hz)
Level
——»
Frequency
Amplitude of change in frequency
response using graphic equalizer
controls
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.
Peak
am.
~
--
tg
Compensated peak
Overall frequency
response
=
Level
Frequency ——*—
12
<ARE1089 >
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 slightly.
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 gradually.
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 at 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.
@) Cymbals
(2) Soprano
@) Alto
@ Tenor
() Baritone
(6) Bass
@® Violin
Cello
@) Contrabass
@) Guitar
4) Piano
@® Trumpet
@3) Trombone
(4 Piccolo
45 Flute
Alto clarinet
English horn
@) Pipe organ
(2) Tenor saxphone
Oboe
Bassoon
@3) Electric organ
|
|
{
|
@i) Bass drum
J
20
40
60 100
200
400
600
ih
2k
4k
6k
10k
20m
Frequency (Hz)
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