Crest Audio X-RACK XR-20 -, Schematic Diagrams, Page: 2 / 20

SOLO
OFF
GAIN
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
EQ
ON
L
ODD
R
EVEN
=
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
PAN
MUTE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
G3-4
G1-2
L-R
LO CUT
LEV
PAN
MONO
BUS
ASSIGN
SIG
PK
G1
AFL
AUX SENDS
5
6
TAPE
IN
FROM
MONITOR
P
H
O
N
E
S
1
3
5
7
10 0
9
2 8
6 4
SUM
MONO
1
3
5
7
10 0
9
2 8
6
4
MONITOR
SOURCE
SELECT
(ADD)
SOLO
OFF
A1-2
TAPE
IN
1
3
5
7
10 0
9
2 8
6
4
ALT OUT (L-R)
40
15
10
0
10
•
5 20
+
–
40
15
10
0
10
•
5 20
+
–
40
15
10
0
10
•
5 20
+
–
40
15
10
0
10
•
5 20
+
–
40
15
10
0
10
•
5 20
+
–
1
3
5
7
10 0
9
2 8
6 4
1-2
TO A1-2
TO L- R
AFL AFL
TAPE
IN
M
GROUP ASSIGN TO MAINS
A5 A6
L
R
AUX
OUT
AUX
OUT
AUX
OUT
AUX
OUT
AUX
OUT
SOLO PWR
L R
G2 G3 G4
G1 G2 G3 G4
LAMP
12V
5
10
0
5
10
20
30
LEFT RIGHT MONO
ADD MONO
TO PHONES
& ALT OUT
1
GROUP MASTERS
0
9
6
12
3
6
9
3
15
24
18
21
LM
LF
HF
HM
5
10
0
5
10
20
30
15
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
2
LM
LF
HF
HM
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
3
LM
LF
HF
HM
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
4
LM
LF
HF
HM
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
5
LM
LF
HF
HM
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
6
LM
LF
HF
HM
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
7
LM
LF
HF
HM
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
8
LM
LF
HF
HM
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
9
LM
LF
HF
HM
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
10
LM
LF
HF
HM
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
11
LM
LF
HF
HM
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
12
LM
LF
HF
HM
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
S1
LM
LF
HF
HM
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
S2
LM
LF
HF
HM
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
S3
LM
LF
HF
HM
AUX 1-2
PRE
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
40
20
10
0
6
•
3
30
+
–
0
15 15
8 8
+ –
1 2
=
AUX 3-4
PRE
AUX 5-6
PRE
0
15 15
8 8
+ –
0
15 15
8 8
+ –
0
15 15
8 8
+ –
LEV
PAN
S4
LM
LF
HF
HM
SIG
PK
SOURCE IS
PRE
FADER
XR 20
L
ODD
R
EVEN
=
PAN
L
ODD
R
EVEN
=
PAN
L
ODD
R
EVEN
=
PAN
L
ODD
R
EVEN
=
PAN
L
ODD
R
EVEN
=
PAN
L
ODD
R
EVEN
=
PAN
L
ODD
R
EVEN
=
PAN
L
ODD
R
EVEN
=
PAN
L
ODD
R
EVEN
=
PAN
L
ODD
R
EVEN
=
PAN
L
ODD
R
EVEN
=
PAN
L
ODD
R
EVEN
=
BAL
L
ODD
R
EVEN
=
L
ODD
R
EVEN
=
L
ODD
R
EVEN
=
BAL BAL BAL
LINE INPUT
( MIC PAD )
1
EQ
ON
EQ
ON
EQ
ON
EQ
ON
EQ
ON
EQ
ON
EQ
ON
EQ
ON
EQ
ON
EQ
ON
EQ
ON
EQ
ON
EQ
ON
EQ
ON
EQ
ON
AFL AFL
A3 A4
AFL
2 3 4 5 6 7 8 9 10 11 12 S1 S2 S3 S4
SIG
PK
PFL
AUX SENDS AUX SENDS AUX SENDS AUX SENDS AUX SENDS AUX SENDS AUX SENDS AUX SENDS AUX SENDS AUX SENDS AUX SENDS AUX SENDS AUX SENDS AUX SENDS AUX SENDS
20
10
40
50
70
30
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
600
1K
2K
3K
8K 400
5K
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
600
1K
2K
3K
8K 400
5K
300
500
1K
2K
100
SUM
INPUTS
SUM
INPUTS
SUM
INPUTS
SIG
PK
PFL
SIG
PK
PFL
SIG
PK
PFL
SIG
PK
PFL
SIG
PK
PFL
SIG
PK
PFL
SIG
PK
PFL
SIG
PK
PFL
SIG
PK
PFL
SIG
PK
PFL
SIG
PK
PFL
SIG
PK
PFL
SIG
PK
PFL
SIG
PK
PFL
SIG
PK
PFL
SIG
PK
AFL
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
MUTE
G3-4
G1-2
L-R
MONO
BUS
ASSIGN
5
10
0
5
10
20
30
15
G3-4
G1-2
L-R
MONO
3
4
5
6
3
4
5
6
3
4
5
6
3
4
5
6
3
4
5
6
3
4
5
6
3
4
5
6
3
4
5
6
3
4
5
6
3
4
5
6
3
4
5
6
3
4
5
6
3
4
5
6
3
4
5
6
3
4
5
6
3
4
300
500
1K
2K
100
LINE INPUT
( MIC PAD )
LINE INPUT
( MIC PAD )
LINE INPUT
( MIC PAD )
LINE INPUT
( MIC PAD )
LINE INPUT
( MIC PAD )
LINE INPUT
( MIC PAD )
LINE INPUT
( MIC PAD )
LINE INPUT
( MIC PAD )
STR LINE IN
( MIC PAD )
STR LINE IN
( MIC PAD )
STR LINE IN
( MIC PAD )
STR LINE IN
( MIC PAD )
SUM
INPUTS
GAIN
20
10
40
50
70
30
GAIN
20
10
40
50
70
30
GAIN
20
10
40
50
70
30
GAIN
20
10
40
50
70
30
GAIN
20
10
40
50
70
30
GAIN
20
10
40
50
70
30
GAIN
20
10
40
50
70
30
GAIN
20
10
40
50
70
30
GAIN
20
10
40
50
70
30
GAIN
20
10
40
50
70
30
GAIN
20
10
40
50
70
30
GAIN
20
15
40
50
60
30
GAIN GAIN GAIN
20
15
40
50
60
30
20
15
40
50
60
30
20
15
40
50
60
30
LO CUT LO CUT LO CUT LO CUT LO CUT LO CUT LO CUT LO CUT LO CUT LO CUT LO CUT
5
10
0
5
10
20
30
15