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4
There are several factors that can degrade the sound
from even the best loudspeakers in a listening room.
One of the most important is the interaction of sound
from the loudspeakers with large surfaces such as
walls, the fl oor, and the ceiling in the room. Even
with careful loudspeaker placement and acoustical
treatments, there are signifi cant problems that are
caused by room acoustics. These include refl ections
from nearby 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.
SR6001N DFU_1_ENG 1_4.indd 4SR6001N DFU_1_ENG 1_4.indd 4 06.12.21 3:09:56 PM06.12.21 3:09:56 PM
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