Marantz AV8003 Service Manual page 16

surfaces and standing waves that are created between
large parallel surfaces in the room. In a home theater
the situation is further complicated because there are
several listening locations. The effects of room acoustics
on the sound arriving at each person's ears are very
different and the result is a listening experience that is
degraded in a different way for every person in the room.
It is not uncommon to have variations in two adjacent
seats that are as large as 10 dB, particularly in the
frequency range below 250 Hz.
The solution to this problem is to apply room correction
after precisely measuring how each loudspeaker
interacts with the room. Because the room causes
variations in the frequency response of the
loudspeakers that are so large from seat to seat, it
is important to measure each loudspeaker at several
locations in the listening room. This should be done
even if there is only one listener. Measurement at a
single location is not representative of the acoustical
problems in the room and will in most cases, degrade
overall performance. Audyssey MultEQ is the only
technology that can achieve room correction for
multiple listeners in a large listening area. It does so
by combining the data collected at several points in
the room from each loudspeaker and then applying
correction that minimizes the acoustical effects of the
room and is matched to the frequency resolution of
human perception (known as psychoacoustics).
Furthermore, MultEQ correction is applied both
in frequency and time domains and so there are
no artifacts (such as smearing of sound or modal
ringing)that are sometimes associated with traditional
methods of room equalization.
In addition to correcting frequency response problems
over a wide listening area, Audyssey MultEQ provides a
completely automated sound system set-up process. It
identifi es how many loudspeakers are connected to the
amplifi ers and whether they are full-range, satellites, or
subwoofers. If there is a least one subwoofer connected,
Audyssey MultEQ determines the optimum crossover
frequency between each satellite and the subwoofer(s).
It automatically checks the polarity of each loudspeaker
and alerts the user if there are any that may be wired out-
of-phase relative to the others. It measures the distance
to each loudspeaker from the main listening position and
adjusts the delays so that sound from each loudspeaker
arrives at the same time. Finally, Audyssey MuitEQ
determines the playback level of each loudspeaker and
adjusts the volume trims so that all levels are equal.
MultEQ and the Audyssey MultEQ logo are trademarks
of Audyssey Laboratories, Inc. All rights reserved.
DLNA CERTIFIED™ Audio/Video/Image Player
DLNA ® , the DLNA Logo and DLNA CERTIFIED™
are trademarks, service marks, or certifi cation marks
of the Digital Living Network Alliance.
x.v.Color
"x.v.Color" and "x.v.Color" logo are trademarks of
Sony Corporation.
HD Radio technology is a new technology that
TM
enables AM and FM radio stations to broadcast
programs digitally. Digital broadcasting provides
listeners with radically improved audio quality and
reception as well as new data services. Furthermore,
supplemental program services allow listeners to
select from up to 8 HD Radio programs multicast on
a single FM HD Radio channel. For more information
on HD Radio technology, visit "www.ibiquity.com".
TM
HD Radio Technology Manufactured Under License
TM
From iBiquity Digital Corp. U.S. and Foreign Patents.
HD Radio
and the HD Radio logo are proprietary
TM
trademarks of iBiquity Digital Corp.
XM Satellite Radio Ready
The XM name and related logos are registered
trademarks of XM Satellite Radio Inc.
XM HD Surround uses Neural Surround
to achieve optimal surround sound from XM radio.
© 2006 SIRIUS Satellite Radio Inc. "SIRIUS" and
the SIRIUS dog logo are registered trademarks of
SIRIUS Satellite Radio Inc.
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technology
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