Yamaha CL5 Reference Manual page 152

◆ EQ-1A
EQ-1A is a processor that emulates a famous passive-type vintage EQ. It features a unique
style of operation, allowing you to individually boost and attenuate (cut) each of two frequency
ranges (high and low). Its frequency response is utterly unlike that of a conventional EQ,
producing a unique character that is distinctive of this model. The input/output circuits and
vacuum tubes produce a tonal character that is highly musical and well-balanced.
3 4 5
1 2
1
IN switch
Turns the processor on or off.
When the switch is off, the signal will bypass the filter section, but pass through the
input/output transformer and amp circuits.
2
LOW FREQUENCY knob
Sets the frequency of the low range filter.
3
(LOW) BOOST knob
Sets the amount of boost applied to the frequency band specified by the LOW
FREQUENCY knob.
4
(LOW) ATTEN knob
Sets the amount of attenuation applied to the frequency band specified by the LOW
FREQUENCY knob.
5
BAND WIDTH knob
Sets the width of the frequency band controlled by the high range filter.
As you rotate the knob toward the right (Broad), the band will become wider and the
peak level will decrease. This affects only the response of the boost.
6 HIGH FREQUENCY knob
Sets the frequency of the high range filter. This affects only the response of the boost.
7 8 9
6
7 (HIGH) BOOST knob
Sets the amount of boost applied to the frequency band specified by the HIGH
FREQUENCY knob.
8
(HIGH) ATTEN knob
Sets the amount of attenuation applied to the frequency band specified by the ATTEN
SEL knob.
9
(HIGH) ATTEN SEL knob
Switches the frequency region attenuated by the ATTEN knob.
◆ Dynamic EQ
Dynamic EQ is a newly-developed equalizer that does not emulate any specific model of
equalizer. The sidechain has a filter that extracts the same frequency band as the EQ. This
allows you to apply EQ in the same way as you might apply a compressor or expander to a
specific frequency region, causing the EQ gain to vary dynamically only when a specific
frequency region of the input signal becomes too high or too low. For example you could use
this on a vocal sound as a de-esser, so that EQ is applied to a specific frequency band only
when sibilance or high-frequency consonants reach an unpleasant level, thus preserving a
natural sound that does not impair the original tonal character. Two full-band Dynamic EQs
are provided, enabling you to process a wide range of audio sources.
1
3
4
6
5
9
0
2 8 A 7B
1 BAND ON/OFF button
Turns each band on or off.
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Graphic EQ, Parametric EQ, Effects, and PREMIUM RACK
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Reference Manual