Operating instructions

The 1200 Series Console features a Mix Minus system which may be used for telephone or remote feed applications. Audio is sent to this
‘MIX (-)’ bus from all assigned channels in the console. A jumper is used to assign a channel. If the jumper is in place, a mono mix of the channel‘s
signal is placed on the MIX (-) bus when the AUDITION bus assign switch is pressed (except on 5 channel consoles, where there is no a
udition switch) and when the channel is turned ON.
For TELCO applications, all console channels EXCEPT for the phone channel should be jumpered for MIX (-). The console‘s MIX (-)
output (on the Output Board, see Section 3-10) is fed to the telephone hybrid for audio return to the caller. The hybrid receives all console audio
except for the caller‘s audio so that there will not be feedback in the system.
MIX (-) is assigned for each channel at the factory. To unassign a channel for TELCO use, simply remove the black two pin jumper on that
channel.
INPUT BOARD
MIX MINUS
ASSIGN JUMPER
(each channel)
1
2
6
5
4
9
7
1
3
1
8
2
6
5
4
9
7
1
3
1
8
2
6
5
4
9
7
8
1
3
1
ch 1 ch 2
ch 3
ch 4
ch 5
1
P1
2
6
5
4
9
7
1
3
1
8
1
1
+
+
+
+
1
+
+
1
1
1
1
1
1
1
1
AUD
1
1
+
+
J
1
1
+
+
1
1
1
PGM
1
1
+
+
1
1
+
1
+
+
1
1
1
+
1
1
+
+
1
1
+
1
+
+
1
1
1
1
1
+
+
1
1
+
1
+
+
1
1
1
1
QX
AUD PGM AUD PGM AUD PGM AUD PGM
3 2 5 4
2
6
5
4
9
7
1
3
1
8
2
6
5
4
9
7
1
3
1
8
1
1
Arrakis Systems, inc. --- 6604 Powell st., Loveland, CO 80538 --- 970-461-0730 --- www.arrakis-systems.com
INSTALLATION PROCEDURES
MIX MINUS CHANNEL ASSIGNMENT 3-15)
3.24