ME 60S
microGRAPHIC EQUALIZER
Data Sheet-3
Constant-Q
Constant-Q graphic equalizers arose from
the sound professional’s need for greater
control with less interaction than previ-
ously possible with conventional equal-
izers. You use a constant-Q graphic the
same way you use a conventional graphic.
You just get the desired results quicker,
with far less after adjustment to the adja-
cent sliders.
e accompanying gures dramati-
cally show the advantages of constant-Q
designs. For more technical information,
consult the references on the next page.
Most are available at
www.rane.com/library.html.
Block Diagram
BYPASS
SWITCH
BYPASS
AMPLIFIER
BOOST
TO FILTERS
Channel 1 is shown, channel 2 is identical.
25 Hz
BP
CUT
AMPLIFIER
(3k-40k Hz)
HIGH CUT
FILTER
LEVEL
0 dB
RFI
FILTER
CHANNEL 1
INPUTS
CHANNEL1
OUTPUTS
–6 dB –12 dB +12 dB+6 dB
RANGE
SENSE
OL
OVERLOAD
(+)
(–)
3
2
1
(+)
(–)
–
+
3
2
1
(10-250 Hz)
LOW CUT
FILTER
Constant-Q: Proportional Q:
3dB
1/3 octave 1/3 octave
3dB
3dB
1/3+ octave
3dB
2+ octaves
Bandwidth, dened 3dB down
from peak, remains constant. dramatically with changes in gain.
Bandwidth here changes
FREQUENCY
AMPLITUDE
FREQUENCY
AMPLITUDE
Proportional Q:Constant-Q:
0dB
+3dB
+6dB
1
2
2
1
11
2
2
This design has little
interaction as a
single slider is
moved from
1 to 2. 1 to 2.
moved from
single slider is
aected when a
Both lters are
