Sony STR-D615 Operating Instructions Manual page 18

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Press SUR (SURROUND) ON/OFF to ON.
Press SUR (SURROUND) MODE to select
DOLBY.
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Press DELAY TIME to adjust the delay time.
The delay time changes cyclically each time you
press DELAY TIME and DELAY S, DELAY M or
DELAY L appears on the display according to the
time listed below.
S = 15 msec.
M = 20 msec.
L = 30 msec.
To turn off the surround effect
Press SUR (SURROUND) ON/OFF to OFF. The sound
without surround effect will resume.
Rear level, center level and delay time of the surround is
memorized each time the DELAY TIME, REAR LEVEL -/+
and CENTER LEVEL -/+ buttons are adjusted. They will be
recalled when the surround mode is resumed.
The receiver is preset in the factory to get an optimum rear
level as long as each speaker has an equal efficiency.
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