Marantz SR6001 Manuel d'utilisateur télécharger pdf (Page 8)

ENGLISH

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.

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Marantz SR6001 Manuel d'utilisateur Page 8

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