Yamaha YSP-40D User Manual

You can configure the parameters for Dolby Pro Logic II 
Music and DTS Neo:6 Music to fine-tune the surround 
sound effect.

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Gives the front left and right channel sound a 
wraparound effect, distributed throughout the entire 
surround sound field to give you an expansive feeling.
Choices: ON/OFF
Default setting: OFF

Adjusts the difference in volume between the front 
and surround channels to the desired volume balance.
Control range: –3 (toward the surround direction) to 
+3 (toward the front direction)
Default setting: STD (standard)

Distributes the center channel sound to the left and 
right. If 0 is selected, the center channel sound is 
output only from the center channel.
Control range: 0 to 7
Default setting: 3

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Adjusts the center image from three channels (front 
left and right and center) to varying degrees.
Control range: 0.0 (wider) to 1.0 (toward the center)
Default setting: 0.3