Dolby Laboratories DP564 - Manual (Page 46)

DP564 Multichannel Audio Decoder Listening Room Calibration
5-2
80 Hz
, but if any of those speakers is particularly small, choose the highest
frequency,
120 Hz
. This setting not only produces better response from your
system, but also protects small speakers from damage. In a system that includes a
subwoofer, with all speakers set to
Large
, the crossover value is not applied.
Back Surround Speakers
Two Surround speakers (Ls, Rs) are used in standard 5.1-channel monitoring systems
(setting:
None
). To monitor a Dolby ® Digital Surround EX ™ program, a Back
Surround speaker is required. You can use either a single Back Surround speaker
(setting:
One
), or two speakers for the Back Surround channel (setting:
Two
).
Back
Surround Speaker
settings are reflected in the output level meter display and
the
Monitor Status
menu.
If you use a single Back Surround speaker, use the
Bsl
connector on the rear panel,
and leave the
Bsr
connector unused. If you use two speakers for the Back Surround
channel, use both the
Bsl
and
Bsr
connectors.
When listening to a 5.1-channel program without Surround EX decoding, and the
monitoring environment has two Back Surround speakers, the Bsl output will be the
same as the Ls output, and the Bsr output will be the same as the Rs output.
5.2 Speaker Delay Values
Adjusting speaker delay values is an essential step in configuring your system.
Because Dolby Digital and Dolby Surround Pro Logic
® process signals differently,
different calculations must be used to determine accurate delay settings. Speaker
delay values for Dolby Digital are calculated so that signals from all speakers arrive
at the reference listening position at the same time (coincident arrival).
To calculate the delay settings, measure and record the distance from the reference
listening position to each of the seven speakers:
• Left (L)
• Center (C)
• Right (R)
• Left Surround (Ls)
• Right Surround (Rs)
• Back Surround Left (Bsl)
• Right Surround Right (Bsr)
Make all of these measurements in feet. (If measuring in meters, then multiply the
metric measurements by three to get the approximate distance in feet.)