QSC Audio Output Isolation Transformer IT-42 - Manual (Page 2)

CONFIGURATION
With the IT-42 installed, the CX 302 amplifier can operate in several different configurations listed below.
TWO-CHANNEL OR TWO-ZONE OPERATION (STEREO OR PARALLEL)
Both channels 25V
Both channels 70V
Both channels 100V
One channel 25V, the other 70V or 100V
One channel 70V, the other 100V
BRIDGED MONO OPERATION
140V or 200V
Amplifier settings: To minimize transformer saturation, we recommend always using the amplifier’s 75 Hz input filters. We also
recommend using the clip limiters in most applications. See the amplifier user’s manual for instructions on configuring filters and
clip limiters, as well as configuring the CX 302 for stereo, parallel, or bridged mono operation.
Connecting outputs
Turn off the amplifier before opening the safety shroud over the output barrier strip or making any changes to the output
connections. Always close the safety shroud when you finish working on the output connections and before turning the amplifier
on. The illustrations at right will help you identify the correct output terminals for your distributed line.
Use fully insulated wiring that conforms with local and national electrical and safety codes. Wiring for circuit classes listed below
are as specified by the 1999 National Electrical Code, which is prevalent in the United States. Codes in your location may vary.
25-VOLT LINE
Connect the 25-volt distributed line across the 70V and 100V terminals. Use wiring suitable for a Class 2 circuit.
70-VOLT LINE
Connect the 70-volt distributed line across the COM and 70V terminals. Use wiring suitable for a Class 2 circuit.
100-VOLT LINE
Connect the 100-volt distributed line across the COM and 100V terminals. Use wiring suitable for a Class 2 circuit.
140-VOLT LINE (BRIDGED MONO)
Connect a jumper wire between the COM terminals of Channel 1 and Channel 2. Connect the 140-volt distributed line across the
70V terminals of Channel 1 and Channel 2. Use wiring suitable for a Class 3 circuit.
200-VOLT LINE (BRIDGED MONO)
Connect a jumper wire between the COM terminals of Channel 1 and Channel 2. Connect the 200-volt distributed line across the
100V terminals of Channel 1 and Channel 2. Use wiring suitable for a Class 3 circuit.
SCHEMATIC
COM
70V
100V
25V line
COM
70V
100V
70V line
COM
70V
100V
100V line
COM
COM
70V
70V
100V
100V
140V line
COM
COM
70V
70V
100V
100V
200V line
Ch. 1 + out
Ch. 2 + out
Ch. 1 - out
Ch. 2 - out
COM
COM
70V
70V
100V
100V
QSC Audio Products, Inc. 1675 MacArthur Blvd., Costa Mesa, California 92626 USA
Phone: (714) 754-6175 Fax: (714) 754-6174 Technical Services phone: (714) 957-7150 Technical Services fax: (714) 754-6173
www.qscaudio.com