Dolby ProLogic (HU-831)
The system only works with the CD player or MD player.
The Dolby unit divides the normal stereo channels from left - right to left - center - right.
In addition, ambient surround sound is produced by the rear loudspeakers. This ambient surround sound mirrors the resonance in the recording studio.
Most recordings today are made so that the vocalist/soloist is heard from straight ahead while the orchestra is heard over the entire left-right panorama and from behind.
SOUND MODE controls the number of sound channels:
3 CH Stereo = center loudspeaker connected but without ambient sound.
Dolby ProLogic 5 CH = center loudspeaker connected with surround sound.
The selected function is shown in the display.
The surround sound volume from the rear loudspeakers can be controlled with the "EFFECT/CENTRE" button in its outer position.
The center loudspeaker volume is controlled with the "EFFECT/CENTRE" button in the inner position.
The center loudspeaker is 3x4" if RTI is installed and 6"if RTI is not installed.