Yamaha RX-A800 Owner's Manual page 20

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Connecting the subwoofer
1 Connect the subwoofer input jack to the
SUBWOOFER 1 or 2 jack on this unit with an audio
pin cable.
Set the subwoofer volume as follows.
2
Volume: Set to approximately half volume (or slightly less than
half).
Crossover frequency (if available): Set to maximum.
CROSSOVER/
VOLUME HIGH CUT
MIN
MIN MAX
Subwoofer examples
NOTE
After connection, applying this setting to this unit is required to
activate all speaker connections. With using "Power Amp
Assign" function, you can easily apply the speaker
configuration.
Refer to "Power Amp Assign" (☞p. 91) for details on using
"Power Amp Assign" function.
MAX
CONNECTIONS
Connecting speakers
20
En