AC-ProcessorIII Operations
FREQUENCY (center frequency selection)
Selects
the
frequency
to
be
used
as
the
center
of
the frequency
band
to be
compensated
from
the range
20Hz
to
20kHz.
(1/3 octave steps,
31
points)
GAIN (gain adjustment)
Adjusts
the
gain (output level) within the range
-12dB
to +12dB.
(1
dB
steps,
25
points)
Q (Q curve selection)
Sets
one
of
1, 3, 5, 7,
or
20
as
the
sharpness
of
the Q curve.
• Compensation
There
is no need to
compensate
frequency
characteristics if
they
are flat (no
peaks
or
valleys)
when
you have
measured
the
frequency
characteristics with a measuring
device. However,
sometimes
the
frequency
characteristics rise
or
fall in
some
places. If this
happens, the
frequency
characteristics
must
be
compensated. Create a
frequency
curve having
characteristics
that
are opposite
to
the
center
frequency
of parts
where
the characteristics rise
and fall to cancel
out
these
peaks and values,
and
make
the
frequency
characteristics
as
flat
as
possible.
Making the
frequency
characteristics
as
flat as
possible is called
"compensation."
On this unit, frequency characteristics can be
compensated by
PEQ
(Parametric Equalizer).
• Compensation
of
frequency
characteristics
The
figure
below
shows
the relationship
between the
center
frequency, gain and Q
curve.
Level
(dB)
~
Frequency
curve
Center
Frequency (F) Frequency
(Hz)
• Q curve
The Q curve becomes
sharper
when the
numerical value is increased, and
smoother
when the numerical value is decreased.
Flat frequency characteristics can be
made
by
selecting a Q curve opposite
to
that
of
the curve
to be compensated.
Q
curve:
(Q)
I
Q
curve:
20
Q
curve:
1
F:
Center frequency, G: Gain (output level), Q: Q curve
No.
Parametric Equalizer Parameters
Band 1 Band 2
Band 3
(car type)
Channel
F
G
Q F
G
Q
F
G
Q
1
Front
250
Hz
-8
dB
3
2
kHz
-4
dB
1
5
kHz
-4
dB
1
(SEDAN-1) Rear
250
Hz
-10
dB
3
1.25 kHz
OdB
5
8
kHz
OdB
5
2
Front
250
Hz
-10
dB
7
800 Hz
-4
dB
3
8
kHz
-5
dB
1
(SEDAN-2) Rear
80
Hz
3dB
7 125
Hz
-12
dB
5
1.25
kHz
o
dB
5
3
Front
250
Hz
-8
dB
3
1
kHz
-8
dB
3
10
kHz
-6
dB
1
(WAGON-1) Rear
250
Hz
-8
dB
3
800
Hz
-8
dB
1 8
kHz
OdB
5
4
Front
250
Hz
-8
dB
7
400
Hz
-10
dB
7 1.25
kHz
-8
dB
7
(WAGON-2) Rear
125
Hz
-8
dB
3
500
Hz
-5
dB
5
1.6
kHz
OdB
3
5
Front
125
Hz
-4
dB
5
1.25
kHz
-4
dB
3
2
kHz
3
dB
7
(MINI VAN-1)
Rear
250
Hz
-6
dB
1
630
Hz
-4
dB
3
8
kHz
OdB
5
6
Front
250
Hz
-4
dB
3
1.25
Hz
-8
dB
3
80
Hz
3dB
3
(MINI VAN-2)
Rear
250
Hz
-8
dB
3 500 Hz -5
dB
5
8
kHz
o
dB
5
22
DXZ945MP
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