Sony STR-DA2800ES Operating Instructions Manual page 26

4)
When you connect a subwoofer with an auto
standby function, turn off the function when
watching movies. If the auto standby
function of the subwoofer is set to on, it goes
into standby automatically based on the level
of the input signal to the subwoofer, and the
sound may not be output.
You can connect two subwoofers to the
receiver. The same signals are output from
each of the SUBWOOFER jacks.
ZONE 2 connection
Only if you do not use surround back speakers
and front high speakers, you can assign the
SURROUND BACK/FRONT HIGH/
FRONT B/ZONE 2 terminals F and G to
the speakers of zone 2. Set the SURROUND
BACK/FRONT HIGH/FRONT B/ZONE 2
terminals to "Zone2 Speakers" in "Speaker
Connection" in the Speaker Settings menu
(page 94).
See "Using Multi-zone Features" (page 72)
for details on connection and operation in
zone 2.
Front speaker B connection
When you are not using surround back
speakers and front high speakers, you can
assign the SURROUND BACK/FRONT
HIGH/FRONT B/ZONE 2 terminals L and R
to the front speaker B.
Set the SURROUND BACK/FRONT HIGH/
FRONT B/ZONE 2 terminals to "Front B" in
"Speaker Connection" in the Speaker Settings
menu (page 94).
You can select the front speakers with
SPEAKERS (OFF/A/B/A+B) on the front of
the receiver.
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