Dolby Pro Logic Iix 6.1 And 7.1 Channel Surround; Rotel Xs6.1 And 7.1 Channel Surround; Dolby Digital Plus; Dolby Truehd - Rotel RSX-1550 Owner's Manual

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All of these systems are extensions of the existing Dolby Digital 5.1
and DTS 5.1 digital surround sound formats. Users with one center
back speaker (a 6.1 configuration) or two center back speakers (a
7.1 configuration) can take advantage of this extended surround
information. On traditional 5.1 channel systems, Dolby Digital Surround
EX or DTS-ES 6.1 discs sound exactly the same as 5.1 channel discs in
each respective format.
If you have configured your system with one or two center back
speakers, decoding of DTS-ES discs is automatic, just as it is with
standard DTS soundtracks. Likewise, decoding of Dolby Digital Surround
EX discs is automatic with one exception. Some Surround EX titles do
not have the detection "flag" encoded on the disc. To activate the Dolby
Digital Surround EX features for these discs (or for standard 5.1 channel
Dolby Digital discs), you must manually activate Dolby Surround EX
processing.

Dolby Pro Logic IIx 6.1 and 7.1 Channel Surround

The latest technology from Dolby uses advanced matrix decoding for
the surround channels in a 6.1 channel or 7.1 channel system. Working
with any 2.0 channel or 5.1 channel recording, Dolby Pro Logic IIx
processing distributes the surround channel information among three
or four surround channels, with a Music mode optimized for musical
recordings and a Cinema mode optimized for film soundtracks.

Rotel XS6.1 and 7.1 Channel Surround

This receiver also features Rotel XS (eXtended Surround) processing
provides extended surround performance on 6.1 and 7.1 channel
systems. The key benefit of Rotel XS is that it works at all times with all
multichannel digital signals, even those that might not otherwise activate
Dolby Digital EX or DTS-ES surround decoding for the center back
channel(s). Always available when center back speaker(s) are configured
in the system setup, Rotel XS decodes the surround channels and
distributes the extended surround channels to the center back speaker(s)
in a way that tends to create a diffuse surround effect. Rotel XS works
with matrix-encoded surround signals (such as non-flagged DTS-ES and
Dolby Surround EX discs) as well as digital source material that is not
Dolby Surround EX encoded (such as DTS 5.1, Dolby Digital 5.1, and
even Dolby Pro Logic II decoded Dolby Digital 2.0 recordings).

Dolby Digital Plus

Built on Dolby Digital, the multichannel audio encoding standard for
DVD and HD broadcasts, Dolby Digital Plus was designed for the new
high-resolution delivery formats, but remains compatible with current
A/V receivers. It is supported by the HDMI digital connection standard.
Dolby Digital Plus can provide up to 7.1 channels with discrete channel
output at higher bitrates than Dolby Digital. Dolby Digital Plus is an
optional sound format for Blu-ray, and a mandatory inclusion for HD
DVD discs.
Dolby True HD
Dolby TrueHD is based on lossless coding technology to deliver studio
master-quality sound. Dolby TrueHD supports up to eight full-range
channels (the maximum allowed by Blu-Ray) of 24-bit/96 kHz audio.
Dolby TrueHD is supported by the HDMI v1.3 digital connection.
Additional features include Dialogue Normalization, which maintains
the same volume level when changing to other Dolby Digital and Dolby
TrueHD programming, and Dynamic Range Control (or 'Night Mode'),
reducing peak volume levels to allow late-night viewing of high-energy
surround sound without disturbing others. Dolby TrueHD is an optional
sound format for Blu-ray Disc, and a mandatory format for HD DVD.
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DTS-HD Master Audio and DTS-HD High Resolution Audio

Like Dolby's TrueHD, DTS-HD Master Audio is an advanced lossless
audio codec which is an optional sound format for Blu-ray discs, again
delivering the original recorded sound 'bit-for-bit'. It is also an optional
format for HD-DVD disc recordings. DTS-HD Master Audio is compatible
with the HDMI v1.3 connection standard, and supports a maximum of
192kHz sampling at 24-bit depth in two-channel mode, and 24bit/
96KHz resolution for eight channels in multichannel mode. A DTS-HD
capable receiver can also decode discs recorded with DTS-HD High
Resolution Audio. This format is not lossless but delivers virtually all of the
original recording, though not literally identical to the studio master.

DSP Music Modes

Unlike all of the formats mentioned above, the receiver offers four
surround modes that are not part of a specific recording/playback
system. These modes (DSP 1–4) use digital signal processing that
adds special acoustic effects to any signal. DSP processing can be
used with Dolby Surround recordings, Dolby Digital recordings, CDs,
radio broadcasts, or any other source material; however, typically DSP
settings would be used with source material for which there is no specific
surround decoder.
The four DSP MODES in the receiver use digital delay and reverberation
effects to simulate progressively larger acoustic environments with DSP 1
being the smallest type of venue (such as a jazz club) and DSP 4 being a
large venue (such as a stadium). Typically used to add ambience and a
sense of space when listening to music sources or other sources that lack
surround sound encoding..

2CH/5CH/7CH stereo formats

The receiver also provides four modes that disable all surround
processing and deliver stereo signals to amplifiers and speakers. The
four options are:
2CH Stereo: Turns off the center channel and all surround channels
in the system and delivers a conventional 2-channel signal to the front
speakers. If the system is configured to route bass signals from the front
speakers to the subwoofer, this capability remains in effect.
Analog Bypass: For 2-channel analog inputs, there is a special stereo
mode that bypasses ALL of the receiver's digital processing. The two front
speakers receive pure analog stereo full-range signals with no subwoofer
crossover, no delay, no level adjustments, and no contour adjustment.
5CH Stereo: Distributes a stereo signal to 5.1 channel systems. The
left channel signal is sent, unchanged, to the front left and surround left
speakers. The right channel is sent to the front right and surround right
speakers. A mono sum of the two channels is sent to the center channel
speaker.
7CH Stereo: This mode is the same as 5CH Stereo described above
except that it also distributes stereo signals to center back speaker(s)
installed in the system.

Other Digital Formats

Several other digital formats are not surround sound formats at all, but
rather systems for digital 2-channel recordings.
PCM 2-channel: This is an uncompressed 2-channel digital signal such
as that used for standard CD recordings and some DVD recordings,
particularly of older films.
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