IWIR TX925, WIR SYS 1 Infrared Listening Systems
5
Baseband Connection, Four Channel Operation
MOD 232 MODULATOR #2 (REAR)
MOD 232 MODULATOR #1 (REAR)
COAXIAL CABLE (WCA 068)
TX9 BASEBAND INPUT
BASEBAND
OUTPUT
BASEBAND
OUTPUT
BASEBAND
INPUT
A249
IMPORTANT: Each channel must be set to a different frequency!
Audio Connection
Microphone Input:
With the modulator DIP switches set for microphone input, the 3-pin XLR jack accepts balanced microphones.
Power for condenser microphones can be selected by DIP switch. The minimum input level is 100 µV and the
maximum level is 90 mV.
XLR Line-Level Input:
With the modulator DIP switches set for line-level input, the 3-pin XLR jack accepts balanced line-level audio
inputs. The minimum input level is 21 mV and the maximum level is 10 V.
1/4” TRS Line-Level Input:
The 1/4” Tip/Ring/Sleeve (TRS) jack can accept only a balanced or unbalanced line-level input. A 25 V, 70 V, or 100
V speaker line can be connected to the balanced line input using an appropriate attenuator. “T” pads made with
resistors yield better fidelity than speaker matching transformers.
Audio Connection
BALANCED LINE USING 3–PIN CONNECTOR
IN PHASE
1
2
3
3 PIN CONNECTOR
A108
UNBALANCED LINE USING 3–PIN CONNECTOR
1
2
3
3 PIN CONNECTOR
A105
BALANCED LINE USING 1/4" CONNECTOR
IN PHASE
A106
UNBALANCED LINE USING 1/4" CONNECTOR
A107
