Manual-2
Controls and Operation
Parametric filter controls
GAIN
: Range is +12 dB to -24 dB, with a 0 dB center detent.
BW (bandwidth)
: Range is
1
/
12
to 2 octaves with each dot representing ¼ octave.
FREQUENCY
: Total range is 12.5 Hz to 20 kHz, with the multiplier switch.
Each
Hz
multiplier covers a 4 octave range:
x0.1
operates from 12.5 Hz to 200 Hz
x1
operates from 125 Hz to 2 kHz
x10
operates from 1.25 kHz to 20 kHz
Individual switches
BYPASS
each filter without affecting the others.
Individual
OL (overload)
warning indicators light at 0 dBFS (digital clipping).
Low Shelf
Filters
A1
and
B1
include a
LOW SHELF
mode. When the LOW SHELF switch is
in
, the
yellow indicator is lit and the filter is in LOW
SHELF mode. Filter B1 LOW SHELF mode is
disabled in 10-BAND mode. The BW control has
no effect in LOW SHELF mode. The minimum
Low Shelf frequency is 25 Hz (0.1 multiplier). Set-
tings below 25 Hz default to 25 Hz.
High Shelf
Filters
A5
and
B5
include a
HIGH SHELF
mode. When the HIGH SHELF switch is
in
, the
yellow indicator is lit and the filter is in HIGH
SHELF mode. Filter A5 HIGH SHELF mode is
disabled in 10-BAND mode. The BW control has
no effect in HIGH SHELF mode.
Tone controls
Independent, 3-band
TONE
controls are
provided for each channel. The Low-Mid cutoff
is 300 Hz. The Mid-High cutoff is 4 kHz. These
Tone controls are enhanced, 2
nd
-order filters. The
HIGH and LOW filters are shelving. Phase shift
is zero degrees with the controls at their center de-
tent. Only the A-channel Tone controls are active
in 10-BAND mode.
Cut Filters
2
nd
-order Butterworth
LOW-
and
HIGH-
CUT FILTERS
are provided for each channel.
The range of the LOW-CUT Filter is 15 Hz to
240 Hz. The range of the HIGH-CUT Filter is 5
kHz to 20 kHz. Only the A-channel controls are
active in 10-BAND mode.
-24
+14
-22
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
+4
+6
+8
+10
+12
d
B
u
20
20k
50
100
200
500
1k
2k
5k
10k
Hz
-24
+14
-22
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
+2
+4
+6
+8
+10
+12
d
B
u
20
20k
50
100
200
500
1k
2k
5k
10k
Hz
-40
+10
-35
-30
-25
-20
-15
-10
-5
0
+5
20
20k
50
100
200
500
1k
2k
5k
10k
Hz
d
b
u
Low Off,
Mid ‘0’,
Hi Off
Low ‘0’, Mid +6, Hi ‘0’
Low ‘0’,
Mid Off,
Hi ‘0’
Low +6, Mid ‘0’, Hi +6
Low Off,
Mid ‘0’,
Hi Off
Low ‘0’, Mid +6, Hi ‘0’
Low ‘0’,
Mid Off,
Hi ‘0’
Low +6, Mid ‘0’, Hi +6
-40
+10
-35
-30
-25
-20
-15
-10
-5
0
+5
20
20k
50
100
200
500
1k
2k
5k
10k
Hz
d
b
u
