Yamaha RX-Z9 用户指南

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For the replay of multi-channel music the THX Music 
Mode should be selected. In this mode THX ASA 
processing is applied to the surround channels of all 5.1 
encoded music sources such as DTS, and Dolby Digital to 
provide a wide stable rear soundstage. This mode is to be 
used with multi-channel music sources such as DTS 5.1 
music and Dolby Digital 5.1 music.

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If your chosen listening room layout (for practical or 
aesthetic reasons) results in most of the listeners being 
close to the rear wall, the resulting bass level can be 
sufficiently reinforced by the boundary that the overall 
sound quality becomes ‘boomy’. THX Ultra2 receivers 
contain the BGC (Boundary Gain Compensation) feature 
to provide an improved bass balance. BGC can be selected 
by choosing ‘On’ from the ‘BGC’ section of the ‘THX 
Set’ setup menu.

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Before any home theatre component can be THX Ultra2 
certified, it must pass a rigorous series of quality and 
performance tests. Only then can a product feature the 
THX Ultra2 logo, which is your guarantee that the Home 
Theatre products you purchase will give you superb 
performance for many years to come. The THX Ultra2 
specification provides uncompromised eight-channel 
playback of any multi-channel program, whether movie 
soundtracks or music over the widest possible seating 
area. In addition, all Ultra2 controllers and receivers 
incorporate video switching capable of handling all wide-
bandwidth sources, including HDTV and progressive scan 
DVD, without degrading the picture.

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THX Surround EX - Dolby Digital Surround EX is a joint 
development of Dolby Laboratories and the THX Ltd.
In a movie theater, film soundtracks that have been 
encoded with Dolby Digital Surround EX technology are 
able to reproduce an extra channel which has been added 
during the mixing of the program. This channel, called 
Surround Back, places sounds behind the listener in 
addition to the currently available front left, front center, 
front right, surround right, surround left and subwoofer 
channels. This additional channel provides the opportunity 
for more detailed imaging behind the listener and brings 
more depth, spacious ambience and sound localization 
than ever before.
Movies that were created using the Dolby Digital 
Surround EX technology, when released into the home 
consumer market may exhibit wording to that effect on the 
packaging. A list of movies created using this technology 
can be found on the Dolby web site at www.dolby.com. A 
list of available DVD software titles encoded with this 
technology can be found at www.thx.com.
Only receiver and controller products bearing the THX 
Surround EX logo, when in the THX Surround EX mode, 
faithfully reproduce this new technology in the home. 
This product may also engage the THX Surround EX 
mode during the playback of 5.1 channel material that is 
not Dolby Digital Surround EX encoded. In such case the 
information delivered to the Surround Back channel is 
program dependent and may or may not be very pleasing 
depending on the particular soundtrack and the tastes of 
the individual listener.

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ITU-R is the radio communication sector of the ITU 
(International Telecommunication Union). ITU-R 
recommends a standard speaker placement which is used 
in many critical listening rooms, especially for mastering 
purposes.

00EN.00_RXZ9_U.book  Page 124  Friday, October 17, 2003  11:40 AM