What is the time delay switch for on a sa 5760 receiver

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Surround Sound System Settings ---- Correct Time Delay Setting in Multi-channel Audio

A correctly set surround sound system can yield dramatic improvements to your
home theater sound or multi-channel music listening experience. In particular,
a correctly set time delay setting between the different channels is essential
for a realistic and unified surround soundfield.
Luckily, most of today's surround processors make setting the time delays
between the rear and the fronts a matter of a few entries in the setup menu.
Yet having a proper understanding of the principles behind correct time delay
settings is essential for the best results.
In this guide, we explain the principles behind time delay settings in surround
sound and show you how to adjust your surround processor or AV receiver for the
best surround sound field.

Time Delay Setting in Multi-channel Surround Sound Systems

Correct home theater speaker placement and properly balanced sound levels
between the different channels in multi-channel audio, while crucial, are not
enough to sustain a unified soundfield in a surround sound setup. A correctly
set surround sound system requires that sound from all the different speakers
reach the listener at exactly the same instant.
This explains why all fronts, left, right and center channel speakers, should
be set at exactly the same distance from the listening position. At the same
time, in a typical home theater setup, the surround speakers are closer to the
viewer than the fronts.

To compensate for this distance discrepancy, surround sound playback systems
apply a split-second delay to the surround sound channels.
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