Pioneer CA-100 Operating Instructions Manual page 9

Level
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
response using ordinary tone con-
(dB) trols
——~ Frequency
[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 con-
trols on the graphic equalizer. (See Fig. 3).
[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 depending on the effects of the struc-
ture of the room and its furniture and on the listening
position.
Graphic Equalizer Section
60 150
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FREQUENCY(Hz)
response using graphic equalizer
Amplitude of change in 'coat
fo controls
(68) t t iis ee
60Hzj_ | 150Hz 400Hz WikHz 2.4kH2i 6kHz | 15kH2
a +10 {.
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10 100 tk 10k (Hz)
——~ Frequency
Fig. 2
o
3 Peak
ol
Compensated peak
|. —sy
Phe
ee .
Overall frequency
Although there is minimal treble attenua-
tion 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 this, turn up the 150 Hz con-
trol slightly. H
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.
Frequency ——=—
Fig. 3
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 examples 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.
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