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correcting the tonal and spatial errors that occur. On this product,
when the THX indicator is on, THX features are automatically added
in Cinema modes (e.g. THX Cinema, THX Surround EX).
• Re-Equalization
The tonal balance of a film soundtrack will be excessively bright and
harsh when played back over audio equipment in the home because
film soundtracks were designed to be played back in large movie
theaters using very different professional equipment. Re-Equalization
restores the correct tonal balance for watching a movie soundtrack in
a small home environment.
• Timbre Matching
The human ear changes our perception of a sound depending on the
direction from which the sound is coming. In a movie theatre, there is
an array of surround speakers so that the surround information is all
around you. In a home theatre, you use only two speakers located to the
side of your head. The Timbre Matching feature filters the information
going to the surround speakers so that they more closely match the
tonal characteristics of the sound coming from the front speakers. This
ensures seamless panning between the front and surround speakers.
• Adaptive Decorrelation
In a movie theatre, a large number of surround speakers help create
an enveloping surround sound experience, but in a home theatre
there are usually only two speakers. This can make the surround
speakers sound like headphones that lack spaciousness and
envelopment. The surround sounds will also collapse into the closest
speaker as you move away from the middle seating position. Adaptive
Decorrelation slightly changes one surround channel’s time and
phase relationship with respect to the other surround channel. This
expands the listening position and creates—with only two speakers—
the same spacious surround experi
ence as in a movie theatre.
• THX Ultra2/Select2 Plus
Before any home theatre component can be THX Ultra2/Select2 Plus
certified, it must incorporate all the features above and also pass a
rigorous series of quality and performance tests. Only then can a
product feature the THX Ultra2/Select2 Plus logo, which is your
guarantee that the Home Theatre products you purchase will give you
superb performance for many years to come. THX Ultra2/Select2 Plus
requirements cover every aspect of the product including pre-
amplifier and power amplifier performance and operation, and
hundreds of other parameters in b
oth the digital and analog domain.
• THX Surround EX
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 marke
t may exhibit wording to tha
t effect on the
packaging. A list of movies created using this technology can be
found on the Dolby web site at www.dolby.com.
Only amplifier 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 will be program dependent and may or may
not be very pleasing depending on the particular soundtrack and the
tastes of the individual listener.
• Boundary Gain Compensation™
Depending on the listener’s and the subwoofer’s position, the listener
may experience an excessive bass effect. This feature compensates
for excessive bass resulting from a boundary gain effect. This feature
is designed to operate when used with a subwoofer certified to THX
Ultra2/Select2™ specifications.
• THX Loudness Plus Description
THX Loudness Plus is a new volume control technology featured in
THX Ultra2 Plus™ and THX Select2 Plus™ Certified amplifiers. With
THX Loudness Plus, home theater audiences can now experience the
rich details in a surround mix at any volume level. A consequence of
turning the volume below Reference Level is that certain sound
elements can be lost or perceived differently by the listener. THX
Loudness Plus compensates for the tonal and spatial shifts that occur
when the volume is reduced by intelligently adjusting ambient
surround channel levels and frequency response. This enables users
to experience the true impact of soundtracks regardless of the volume
setting. THX Loudness Plus is automatically applied when listening in
any THX listening mode. The new THX Cinema, THX Music, and THX
Games modes are tailored to apply the proper THX Loudness Plus
settings for each type of content.
• ASA Description
ASA is a proprietary THX technology which processes the sound fed
to 2 side and 2 back surround speakers to provide the optimal
surround sound experience. When you set up your home theater
system using all eight speaker outputs (Left, Center, Right, Surround
Right, Surround Back Right, Surround Back Left, Surround Left and
Subwoofer), be sure to go to the THX Audio Set-up screen and choose
the setting that most closely corresponds to the speaker spacing,
which will re-optimize the surround sound-field. ASA is used in three
modes; THX Ultra2 Cinema, THX Ultra2 Music and THX Ultra2 Games.
• THX Ultra2/Select2 Cinema
THX Ultra2/Select2 Cinema mode plays 5.1 movies using all 8
speakers giving you the best possible movie watching experience. In
this mode, ASA processing blends the side surround speakers and
back surround speakers providing the optimal mix of ambient and
directional surround sounds.
DTS-ES (Matrix and 6.1 Discrete) and Dolby Digital Surround EX
encoded soundtracks will be automatically detected in Ultra2/Select2
Cinema mode if the appropriate flag has been encoded.
Some Dolby Digital Surround EX soundtracks are missing the digital
flag that allows automatic switching. If you know that the movie that
you are watching is encoded in Surround EX, you can manually select
the THX Surround EX playback mode, otherwise THX Ultra2/Select2
Cinema mode will apply ASA processing to provide optimum replay.
• THX Ultra2/Select2 Music
For the playback of multi-channel music the THX Ultra2/Select2
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, Dolby Digital and DVD-Audio to provide a wide stable
rear soundstage.
• THX Ultra2/Select2 Games
For the playback of stereo and multi-channel game audio the THX
Ultra2/Select2 Games mode should be selected. In this mode THX
ASA processing is applied to the surround channels of all 5.1 and 2.0
encoded game sources such as analog, PCM, DTS and Dolby Digital.
This accurately places all game audio surround information,
providing a full 360 degree playback environment. THX Ultra2/Select2
Games mode is unique as it gives you a smooth transition of audio in
all points of the surround field.
THX, the THX logo, Ultra2 Plus and Select2 Plus are trademarks of THX
Ltd. which may be registered in some jurisdictions. All rights reserved.
All other trademarks are the property of their respective owners.
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