Meridian Audio 861 - Manual (Page 37)

33
DSP Presets
THX
As with the PLIIx THX DSP preset, THX re-equalises
the signals to suit domestic listening conditions, and
applies frequency-response correction and decorrelation
to the surround channels to make the surround sound
more realistic. It can be used whether or not your other
equipment is THX approved.
THX DSP preset parameters
Parameter Options What it changes
Surround Surr. Rear,
Surr. Side,
Surr. All Switches the surround
signal between the side
and rear speakers.
PLIIx Mov6, THX Surround EX, PLIIx
Mus6, THX Ultra2 Cinema, and THX
Music
These presets are available if you have four surround
speakers. They use Dolby Pro Logic IIx, Dolby
Surround EX, and THX Ultra2 Cinema processing to
generate multiple signals for larger home theatres.
PLIIx Mov6 uses extended PLII technology from Dolby
to generate four surround signals from traditional
multichannel source material like Dolby Digital 5.1. It is
intended for use with movie soundtracks.
PLIIx Mus6 also creates four surround signals; it is
intended for multichannel music playback from sources
such as DVD-A or SACD music discs.
THX Ultra2 Cinema and THX Music use a THX
proprietary process called advanced speaker array
to provide a mix of ambient and directional surround
sounds using four surround speakers. Optimum
performance of THX Ultra2 Cinema and THX Music
is produced when the two rear speakers are placed
close together behind the listening position. THX Ultra2
Cinema is recommended for movie soundtracks that
are not Dolby Surround EX encoded, and THX Music is
recommended for listening to multichannel music.
PLIIx Mov6, THX Surround EX, PLIIx
Mus6, THX Ultra2 Cinema, and THX
Music preset parameters
Parameter Options What it changes
LFE -28dB to 0dB The relative level of the
LFE bass channel.
Ambisonics
The Ambisonics preset allows you to decode
multichannel sources which have been encoded in
Ambisonics B format.
Ambisonics B format contains four independent
channels of information to give a three-axis
representation of the sound at the recording position.
The signals are: mono sound pressure, left-right
velocity component, front-back velocity component, and
up-down velocity component.