Pro Logic II material can be played back by normal Stereo equipment (as
Stereo) or decoded into 5 channel surround-sound.
Dolby Pro Logic II is compatible with the earlier 4 channel (Left, Centre,
Right and mono Surround) Dolby Pro Logic system (which was the
decoding counterpart to Dolby Surround encoding) as used widely on
Video tapes, TV broadcasts and earlier films.
Note: Pro Logic does not include a Low Frequency Effects channel for
the Subwoofer, but the 640R can create a Subwoofer output (for 5.1) via
Bass management. Refer to the ‘Tone/Sub/LFE configuration’ section in
the ‘Operating instructions’ part of this manual.
Pro Logic IIx
A newer version of Dolby Pro Logic II which is able to recreate 6 or 7
discrete surround sound channels (with fully stereo Back Surrounds in 7
channel mode) from suitable encoded stereo source material. Pro Logic
IIx also has modes for post processing either Stereo material or 5.1
material into 6 or 7 channels whether or not it has been Pro Logic IIx
encoded. When 5.1 decoding is required, Dolby Prologic II decoding will
always be used by the 640R in place of Pro Logic IIx as IIx only works for
6 or 7 channel output.
Note: Pro Logic IIx does not include a Low Frequency Effects channel for
the Subwoofer, but the 640R can create a Subwoofer output (for
6.1/7.1) via Bass management. Refer to the ‘Tone/Sub/LFE
configuration’ section in the ‘Operating instructions’ part of this manual.
DTS Neo:6
A DTS technology which is able to recreate 6 channel (Left Front, Right
Front, Centre, Left Surround, Right Surround, Surround Back ) surround
sound from suitable analog matrix encoded stereo source material. DTS
Neo:6 material can be played back by normal Stereo equipment (as
Stereo) or decoded into 6 channel surround-sound.
Note: Neo:6 does not include a Low Frequency Effects channel for the
Subwoofer, but the 640R can create a Subwoofer output via Bass
management. Refer to the ‘Tone/Sub/LFE configuration’ section in the
‘Operating instructions’ part of this manual.
DTS Neo:6 can also be be decoded as 7.1 by sending the Surround Back
decode to the both the Surround Back Left and Right speakers (forming
two mono Back Surrounds).
DTS 96/24
A DTS technology that provides 5.1 channels of 96kHz / 24bit audio
(along with video if required) on DVD-Video and DVD-Audio (video zone)
discs (when suitably encoded in DTS 96/24). DVD players which allow
'DTS digital out' pass the DTS 96/24 bitstream over S/PDIF for decoding
in the 640R.
DSP modes
These modes allow a realistic surround-sound experience from source
material that has no encoding at all. The surround sound effect is
achieved by Digital Signal Processing of the Analog or Digital stereo
source used. Five modes are possible: PassThru, Theater, Hall, Movie
and Music.
Stereo/ Sub
Only the Front Left and Front Right speakers (and subwoofer if selected)
have output in this mode. If an analog source is selected it will be
converted to digital via 24 bit A/D converters to allow digital domain sub
creation and bass/treble controls.
If a digital source is selected the 640R will be processing either LPCM
stereo (from the digital outputs of a CD player for instance) or a Stereo
downmix of DD or DTS material (from the digital output of a DVD player
for instance).
Analog Stereo Direct
Selects the analog inputs for the current source directly with no A/D
conversion, DSP processing, Bass/Treble or subwoofer channel active.
Provides the very best fidelity for analog Hi-Fi source equipment. In this
mode the 640R is acting just like a normal Hi-Fi integrated amplifier.
18
The 640R has several music and home-cinema listening modes
available. The output from the 640R will depend both on the source
signal present, the speaker setup selected and the decode mode
selected on the 640R. Before we describe how to operate the 640R,
below is a brief guide to the Surround Sound formats that the 640R is
compatible with:
Dolby Digital
Known also as DD (3/2) or DD 5.1, provides (up to) 5.1 output from
suitable encoded Dolby Digital material, with 5 main channels (Front
Left, Front Right, Centre, Surround Left, Surround Right) and a Low
Frequency Effects Channel for the subwoofer, all discretely encoded.
Decoding Dolby Digital requires a Dolby Digital encoded DVD disc and a
digital connection from the source equipment (Such as a DVD player) to
the 640R.
Note: Dolby Digital and DTS formats can sometimes carry less channels
than their maximum such as Dolby Digital (2/0) which means a Dolby
Digital encoded signal which is actually only carrying a two channel
stereo signal (other channels inactive).
DTS
Known also as DTS (3/2) or DTS 5.1, DTS provides (up to) 5.1 output
from suitable encoded DTS material, with 5 main channels (Front Left,
Front Right, Centre, Surround Left, Surround Right) and a Low Frequency
Effects Channel for the subwoofer, all discretely encoded. Decoding DTS
requires a suitably encoded DTS disc and a digital connection from the
source equipment to the 640R.
Dolby Digital EX
Known also as DD (3/3) or DD 6.1, an enhanced form of Dolby Digital.
On top of the discretely encoded 5.1 channels DD EX provides an extra
6th channel (Surround Back, giving 6.1) matrix encoded into the rear
surrounds for greater image depth and more solid sound localisation
behind the listener. DD EX requires a DD EX encoded disc. DD EX is
backwards compatible with DD 5.1 decoding. If DD EX is decoded as
normal DD the Surround Back signal will be present in both Left and
Right Rear Surrounds (forming a phantom rear centre). It can also be
decoded as 7.1 by sending the Surround Back decode to both the
Surround Back Left and Right speakers (forming two mono Back
Surrounds).
DTS-ES Matrix
Known also as DTS (3/3) Matrix, an enhanced form of DTS. On top of the
discretely encoded 5.1 channels DTS ES also provides an extra 6th
channel (Surround Back giving 6.1), matrix encoded into the rear
surrounds for greater image depth and more solid sound localisation
behind the listener. DTS ES requires a DTS ES encoded disc. DTS ES
material is backwards compatible with DTS 5.1 decoding. If DTS ES is
decoded as normal DTS the Surround Back signal will be present in both
Left and Right Rear Surrounds (forming a phantom rear centre). It can
also be decoded as 7.1 by sending the Surround Back decode to the
both the Surround Back Left and Right speakers (forming two mono
Back Surrounds).
DTS-ES Discrete
Another enhanced form of DTS, also known as DTS (3/3) Discrete or DTS
ES Discrete 6.1. DTS ES Discrete also provides an extra channel
(Surround Back) for greater image depth and more solid sound
localisation behind the listener, however in this case extra data is
included in the bitstream so that all channels are discretely encoded.
The Surround Back has greater separation from the other channels than
is possible with matrix encoded technologies. DTS-ES Discrete requires
a DTS-ES Discrete encoded disc.
DTS ES Discrete is backwards compatible with both DTS 5.1 and DTS ES
Matrix 6.1 decoding. If DTS ES Discrete is decoded as normal DTS the
Surround Back signal will be present in both Left and Right Rear
Surrounds (forming a phantom rear centre). If DTS ES Discrete is
decoded with DTS ES Matrix the Surround Back signal will be decoded
separately (i.e. as 6.1) but by a matrix process, which will give the same
channel separation as if the source disc were actually DTS ES Matrix
(but not as good as DTS EX Discrete).
It can also be decoded as 7.1 by sending the Surround Back decode to
both the Surround Back Left and Right speakers (forming two mono
Back Surrounds).
Pro Logic II
The replacement for original ProLogic, Pro Logic II is a technology where
5 channels (Front Left, Front Right, Centre, Surround Left, Surround
Right) are encoded into a Stereo mix by an analog matrix process. Dolby
Surround sound modes
Other modes
