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Appendix A: Block Diagram
ALL MIC LEVEL INPUTS > 1.5K OHMS
XLR BALANCED
3-H1, 2-L0, 1-Com
LINE BALANCED OdB
LINE BALANCED 0dB
MIC 1, 3
HA
CH1-3 (0DD)
CH 1, 3
CH 2, 4
CH2-4 (EVEN)
CH5-23 (0DD)
CH5-24 (EVEN)
CH INSERT 0dB
1. TRS BALANCED : Tip-H1, Ring-Lo, Sleeve-Com
2. XLR BALANCED : 3-H1, 2-Lo, 1-Com
3. TRS INSERT UNBALANCED : T1p-Return, Ring-Send, Sleeve-Com
4. A) ALL MIC LEVEL INPUTS > 1.5K ohms
B) ALL LINE LEVEL INPUTS > 10K ohms
C) ALL LINE LEVEL OUTPUTS < 75 ohms
D) ALL MONO BRIDGE LINE LEVEL INPUTS > 5K ohms
B
U
S
1
B
U
S
2
B
U
S
3
B
U
S
4
A
U
X
1
A
U
X
2
A
U
X
3
A
U
X
4
P
F
L
L
P
F
L
R
S
O
L
O
L
S
O
L
O
R
AUX RETURN 1-4
AUX RET
AUX RET
1/ 2, 3/4
+ 4db, 2Kohm
LOW MID HIGH
LOW MID HIGH
LEVEL
BUS 1
0dB
SUM
0dB
SUM
0dB
0dB
SUM
SUM
BUS OUT 1
MAIN LEVEL
MAIN OUT LEFT
L
R
L
R
BUS OUT 2
BUS OUT 3
BUS OUT 4
BUS INSERT 1
BUS INSERT 2
BUS INSERT 3
BUS INSERT 4
UNBALANCED 10K ONCE
BALANCED 75 Ohms
+4dB
BALANCED 75 ONCE
CONTROL ROOM RIGHT
CONTROL ROOM LEFT
+4dB
UNBALANCED 75 +4dB
OdB
230V
FUSE
POWER SW
AC INLET
115V
LED
POWER
LED
AUX SEND 1
AUX SEND 2
AUX SEND 3
7818
7918
AUX SEND 4
BUS 2
BUS 3
BUS 4
SUM
SUM
SUM
SUM
AFL
AFL/PFL
PHONES
PHONES
+18V
+18V
-18V
END
PFL
0dB
0dB
LEVEL
MUTE 3 /4
BALANCE
AUX 3L
AUX 4R
AUX 1L-2P
3 BAND
EQ
SOLO
CONTROL ROOM
RIGHT
LEFT
10 DOT LED METER
MAIN OUT RIGHT
_
_
_
_
_
_
U
N
B
A
L
A
N
C
E
D
7
5
0
d
B
0dB
_
_
_
_
3 BAND
EQ