Sony R-DG1200 Operating Instructions Manual page 16

a)
If you have an additional front speaker
system, connect them to the SPEAKERS
FRONT B terminals. You can select the front
speaker system you want to use with
SPEAKERS (OFF/A/B/A+B) on the front
panel (page 40).
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.
Notes
• When you connect all the speakers with a nominal
impedance of 8 ohms or higher, set "Impedance" in
the Speaker settings menu to "8 Ω". In other
connections, set it to "4 Ω". For details, see "8:
Setting the speakers" (page 39).
• Before connecting the AC power cord, make sure
that metallic wires of the speaker cords are not
touching each other between the SPEAKERS
terminals.
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