Pioneer SC-LX904 Instruction Manual page 31

Contents Connections Playback Setup
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(Example 3) Use Dolby Enabled Speakers (Surround) at the rear
The Dolby enabled speakers are the special speaker that the sound is emitted
toward the ceiling, and have the effect the sound to come from above by
reflecting the sound on the ceiling.
The Dolby enabled speakers (surround) are installed on top of the surround
speakers.
9,10 Dolby Enabled Speakers (Surround)
‰ Speaker Layouts and Selectable Listening
Modes ( p136)
31
Front Panel≫ Rear Panel≫ Remote≫