Yamaha AVENTAGE RX-A2070 Owner's Manual

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XLR jacks
Transmit analog audio signals. Use an XLR balanced cable.
Match the pins and insert the “male” connector of the XLR 
balanced cable until you hear a click.
X
When disconnecting the cable from the unit, hold down the PUSH button 
on the unit and then pull the connector out.
About the XLR jacks
The pin assignments for the XLR jacks of the unit are shown 
below. Before connecting an XLR balanced cable, refer to the 
instruction manual of your device and verify that its XLR 
jacks are compatible with the pin assignments.
AUDIO 4
R
XLR balanced cable(male)
2. HOT
1. GND
3. COLD