Yamaha RX-V540RDS User Manual

Use this feature to adjust the delay applied to center and
rear center channel sounds. This feature works when there
is sound output from the center speakers with a source
such as Dolby Digital or DTS. Ideally, the center speaker
and the rear speakers should be the same distance from
the main listening position as the left and right main
speakers. However, in most home situations, the center
speaker or the rear center speaker is placed in line with
the main speakers or the rear speakers. By delaying the
sound from the center speaker and the rear speakers, you
can adjust the apparent distance from the center speaker
and the rear speakers to the main listening position to
make it seem the same as the distance between the
listening position and main left and right speakers.

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