16
Thunder System Components
4-wire (balanced)
Intercoms can be of any type in any location in the assembly. However, for proper operation
of the intercom channels, the same placement order must be followed at the other side of
the system. A 2-wire system can be interconnected with a 4-wire system at another Adder
II, but not all intercom functions will work (for example, calling).
4-wire (balanced)
4-wire Auxiliary (balanced) intercoms use an individual 5-pin XLR on each of the two
channels in each module. XLR pin functions are given in the following table. Intercom
Module Gain is 0 dB.
PIN FUNCTION IMPEDENCE
SIGNALS
1
Ground
2
Input (+)
600 Ohm input
Line: +8 dBm
3
Input (-)
600 Ohm input
Mic: -32 dBm
4
Out (+)
600 Ohm load
+8 dBm
5
Out (-)
600 Ohm load
+8 dBm
Fig. 2-11: Intercom Module: 4-Wire Auxiliary (balanced)
