OPERATION AND APPLICATIONS
The REQ equalizers are useful signal processing tools where
precise frequency control is needed across the audio spectrum.
When used with an analyzer,the REQ units may be used to tune an
acoustical environment to avoid ringing (feedback), increase clarity,
and flatten the overall frequency response. Insert the graphic equal-
izer between the signal source and the power amplifier or cross-
over. Adjust the level and equalization as required to yield the
desired system response. The Low Cut and High Cut filters are
used to band-limit the frequency response to increase clarity and
reduce noise.
The equalization filters in the REQ313 are constant bandwidth
(constant Q). The bandwidth of each individual filter is guaranteed
to be narrow enough to prevent unwarranted interaction between
filters, yet wide enough to produce exactly the type of correction
curve demanded by even the most unusual acoustic surroundings.
INSTALLATION
Your REQ313 may be installed in a standard 19” rack or placed in
any dry, well ventilated area. The 1/4” connectors are balanced with
the tip being positive (+) and the ring negative (-), or will assume an
unbalanced state with unbalanced (TS) connectors. The XLR con-
nectors are pin 2 positive (+).
EXAMPLE
AUX 2
RETU
RN
0 10
AU
X 1
RETURN
/
TAPE
IN
LEV
E
L
0 10
HEADPHONE L
E
V
E
L
0
10
LEF
T
R
IG
H
T
0
+20
+6
+14
-10
-15
-20
-30
-
+17
+8
0
-4
-1
3
HEAD
PHONE
OUT
P
UT
AUX
1
0 10
AUX
2
0 10
60
LO
W
-15
+
1
5
2.5 K
MI
D
-15
+
1
5
12.5 k
HI
GH
-15
+
1
5
L
R
BAL
11
/1
2
0
+20
+6
+14
-10
-15
-20
-30
AUX
1
0 10
AUX
2
0 10
60
LO
W
-15
+
1
5
2.5 K
MI
D
-15
+
1
5
12.5 k
HI
GH
-15
+
1
5
L
R
BAL
9/10
0
+20
+6
+14
-10
-15
-20
-30
AUX
1
0 10
AUX
2
0 10
60
LO
W
-15
+
1
5
2.5 K
MI
D
-15
+
1
5
12.5 k
HI
GH
-15
+
1
5
L
R
BAL
7/
8
0
+20
+6
+14
-10
-15
-20
-30
AUX
1
0 10
AUX
1
0 10
AUX
2
0 10
60
LO
W
-15
+
1
5
2.5 K
MI
D
-15
+
1
5
12.5 k
HI
GH
-15
+
1
5
L
R
BAL
5/
6
0
+20
+6
+14
-10
-15
-20
-30
AUX
1
0 10
AUX
2
0 10
60
LO
W
-15
+
1
5
2.5 K
MI
D
-15
+
1
5
12.5 k
HI
GH
-15
+
1
5
L
R
PA
N
4
0
+20
+6
+14
-10
-15
-20
-30
AUX
2
0 10
60
LO
W
-15
+
1
5
2.5 K
MI
D
-15
+
1
5
12.5 k
HI
GH
-15
+
1
5
L
R
PA
N
3
0
+20
+6
+14
-10
-15
-20
-30
AUX
1
0 10
AUX
2
0 10
60
LO
W
-15
+
1
5
2.5 K
MI
D
-15
+
1
5
12.5 k
HI
GH
-15
+
1
5
L
R
PA
N
1
0
+20
+6
+14
-10
-15
-20
-30
AUX
1
0 10
AUX
2
0 10
60
LO
W
-15
+
1
5
2.5 K
MI
D
-15
+
1
5
12.5 k
HI
GH
-15
+
1
5
L
R
PA
N
2
0
+20
+6
+14
-10
-15
-20
-30
-
-
-
-
-
-
-
-
TA
P
E
OUT
TA
P
E
IN
R
L
TRIM
LINE
INS
E
RT
MI
C
1
INS
E
RT
INS
E
RT
INS
E
RT
LINE
LINE
LINE
TRIM
TRIM
TRIM
TRIM
TRIM
TRIM
TRIM
PHAN
T
O
M
P
O
WER
LE
FT
RIGH
T
LE
F
T
RIGH
T
LE
F
T
RIGH
T
LE
F
T
RIGH
T
RI
G
H
T O
U
T
AU
X
2
RE
T
. LEFT
LEFT OU
T
AUX 2
RET.
RI
G
H
T
AUX 1
RET.
RI
G
H
T
AUX 1
RET. LEFT
AUX 1
OU
T
AUX 2
OU
T
MI
C
2
MI
C
3
MI
C
4
MI
C
5
/6
MI
C
7
/8
MI
C
9
/1
0
MI
C
1
1
/1
2
+48V
OF
F
+10
+6
0
+10
+6
0
+10
+6
0
+10
+6
0
+10
+6
0
+10
+6
0
+10
+6
0
+10
+60
CORPORATIONC
O
R
P
O
R
A
T
IO
N
MODEL REQ313M
O
D
E
L
R
E
Q
3
1
3
WARNING:W
A
R
N
IN
G
:
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. D
O
N
O
T
E
X
P
O
S
E
T
H
IS
E
Q
U
IP
M
E
N
T
T
O
R
A
IN
O
R
M
O
IS
T
U
R
E
.
TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE BACK.T
O
R
E
D
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C
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T
H
E
R
IS
K
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B
A
C
K
.
NO USER SERVICABLE PARTS INSIDE. REFER SERVICING TO N
O
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IC
A
B
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E
P
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ID
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QUALIFIED SERVICE PERSONNEL.Q
U
A
L
IF
IE
D
S
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R
V
IC
E
P
E
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S
O
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.
RISQUE DE CHOC - NE PAS ENLEVER R
IS
Q
U
E
D
E
C
H
O
C
-
N
E
P
A
S
E
N
L
E
V
E
R
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
VO
LUME
2
P
OWER
A
MPLIFIER RA200
4
3
