Yamaha RX-A3060 Owner's Manual page 133

Surround Back
Selects whether or not surround back speakers are connected and their sizes.
Settings
Select this option when one large speaker is connected.
Large x1
The surround back speaker will produce all of the surround back channel
frequency components.
Select this option when two large speakers are connected.
Large x2
The surround back speakers will produce all of the surround back channel
frequency components.
Select this option when one small speaker is connected.
The subwoofer or front speakers will produce surround back channel
Small x1
low-frequency components lower than the specified crossover frequency
(default: 80 Hz).
Select this option when two small speakers are connected.
The subwoofer or front speakers will produce surround back channel
Small x2
low-frequency components lower than the specified crossover frequency
(default: 80 Hz).
Select this option when no surround back speakers are connected.
None
The surround speakers will produce surround back channel audio.
X
This setting is not available when "Surround" is set to "None", or when "Layout (Surround)" is set to "Front".
Front Presence
Selects whether or not front presence speakers are connected and their size.
Settings
Large Select this option for large speakers.
Small Select this option for small speakers.
None Select this option when no front presence speakers are connected.
Rear Presence
Selects whether or not rear presence speakers are connected and their size.
Settings
Large Select this option for large speakers.
Small Select this option for small speakers.
None Select this option when no rear presence speakers are connected.
X
This setting is not available when "Surround" or "Front Presence" is set to "None".
Subwoofer 1, Subwoofer 2
Selects whether or not a subwoofer is connected to the SUBWOOFER 1 or SUBWOOFER 2 jack
and its phase.
Settings
Select this option when a subwoofer is connected to the SUBWOOFER 1 or
SUBWOOFER 2 jack (phase not reversed). The subwoofer will produce LFE
Normal
(low-frequency effect) channel audio and low-frequency components from other
channels.
Use
Select this option when a subwoofer is connected to the SUBWOOFER 1 or
SUBWOOFER 2 jack (phase reversed). The subwoofer will produce LFE
Reverse
(low-frequency effect) channel audio and low-frequency components from other
channels.
Select this option when no subwoofer is connected to the SUBWOOFER 1 or
SUBWOOFER 2 jack. The front speakers will produce LFE (low-frequency effect)
None
channel audio and low-frequency components from other channels when both
"Subwoofer 1" and "Subwoofer 2" are set to "None".
X
When the bass sound is lacking or unclear, switch the subwoofer phase.
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