Yamaha Aventage MusicCast RX-A870BL Owner's Manual page 118

Surround
Selects whether or not surround speakers are connected and their sizes.
Settings
Select this option for large speakers.
Large
The surround speakers will produce all of the surround channel frequency
components.
Select this option for small speakers.
Small
The subwoofer or front speakers will produce surround channel low-frequency
components lower than the specified crossover frequency (default: 80 Hz).
Select this option when no surround speakers are connected.
None
The front speakers will produce surround channel audio. Virtual CINEMA DSP
works when you select a sound program.
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.
Subwoofer
Selects whether or not a subwoofer is connected and its phase.
Settings
Select this option when a subwoofer is connected (phase not reversed). The
Normal subwoofer will produce LFE (low-frequency effect) channel audio and
low-frequency components from other channels.
Use
Select this option when a subwoofer is connected (phase reversed). The
Reverse subwoofer will produce LFE (low-frequency effect) channel audio and
low-frequency components from other channels.
Select this option when no subwoofer is connected. The front speakers will
None produce LFE (low-frequency effect) channel audio and low-frequency
components from other channels.
X
When the bass sound is lacking or unclear, switch the subwoofer phase.
Layout
Selects the layouts of the surround speakers and front presence speakers.
Surround
Selects a surround speaker layout when surround speakers are used.
Settings
Select this option when surround speakers are placed on the rear side of the
Rear
room.
Select this option when surround speakers are placed on the front side of the
Front
room. Virtual CINEMA FRONT (p.64) works in this case.
X
This setting is not available when "Configuration (Surround)" is set to "None".
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