Sony STR-DG920 - Manual (Page 17)

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a)
If you have an additional front speaker system,
connect them to the SPEAKERS FRONT B
terminals. You can select the front speakers you
want to use with the SPEAKERS (OFF/A/B/A+B)
button on the receiver (page 39).
b)
If you connect only one surround back speaker,
connect it to the SPEAKERS SURROUND BACK
L terminals.
c)
When you connect a subwoofer with an auto
standby function, turn off the function when
watching movies. If the auto standby function is
set to on, it turns to standby mode automatically
based on the level of the input signal to a
subwoofer, then sound may not be output.
Note
Before connecting the AC power cord (mains lead),
make sure that metallic wires of the speaker cords
are not touching each other between the
SPEAKERS terminals.