Pioneer SG-540 Operating Instructions Manual page 6

Level
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OPERATING THE GRAPHIC EQUALIZER
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 ad-
(dB)
+++
justments than ordinary tone controls and sound field com-
pensation.
Some examples of operation are given below.
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1)
a 6QHz| |150H2 400H2 TkHz 2. 4kHzl 6kH2 [isis | if |
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100 Ik
(Hz)
Amplitude of change in frequency
response using ordinary tone con-
trols Fig. 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. (See Fig. 3).
2)
IMPROVING THE ACOUSTICS OF THE
LISTENING ROOM
The ideal listening room is one where the transmission fre-
quency response is flat. In actual fact, however, the acoustics
vary depending on the effects of the structure of the room and
its furniture and on the listening position.
Although there is minimal treble attenua-
tion ina 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 this, turn up the 150 Hz con-
trol
in a room surrounded by drapes and with
Carpets on the floor,
reflection of the sound and both the bass
and the treble are absorbed.
——— Frequency
o
Level
(Hz)
—e Frequency
Amplitude of change in frequency
response using graphic equalizer
controls
100 Ik
Fig. 2
Peak
mn
| rs
ie °
Compensated peak ~ Overall frequency response
Frequency ——*—
Fig. 3
GRAPHIC EQUALIZER
slightly.
there is minimal
In rooms like this, turn up the 60 Hz con-
trol slightly and turn up the frequency
controls above 2.4 kHz gradually.
The above exampies are extremely
general.
The acoustics undergo change in accord-
ance with the furniture in the listening
room, the height of the ceiling and the
listening position, among other factors.
Play the music and try operating each of
the controls to produce the best effect.