Configuringspeakers And Audio; Understanding Speaker Configuration; Speaker Setup - Rotel RSP-1068 Manuel D'utilisation

RSP-1068 Surround Sound Processor
Configuring
Speakers and Audio
This section of the setup process covers items
concerning audio reproduction such as the
number of speakers, bass management includ-
ing subwoofer crossovers, establishing equal
output levels for all channels, delay settings,
and tone contour settings.
Understanding Speaker
Configuration
Home theater systems vary in the number of
speakers and the bass capabilities of those
speakers. The RSP-1068 offers surround modes
tailored to systems with various numbers of
speakers and bass management features which
send bass information to the speaker(s) best
able to handle it – subwoofers and/or large
speakers. For optimum performance, you must
tell the RSP-1068 the number of speakers in
your system and how bass should be distributed
among them.
NOTE: There are two types of bass in a
surround system. The first is bass recorded
in each of the main channels (front, center,
and surround). This bass is present in all
recordings and soundtracks. In addition,
Dolby Digital 5.1 and DTS 5.1 recordings
may have a Low Frequency Effects (LFE)
channel – the .1 channel. This LFE channel,
typically played by a subwoofer, is used
for effects such as explosions or rumble.
The use of the LFE channel will vary from
soundtrack to soundtrack. Recordings that
are not encoded in Dolby Digital or DTS
do not have the LFE channel.
The following configuration instructions refer
to LARGE and SMALL speakers, referring more
to their desired bass configuration than their
physical size. Specifically, use the LARGE setting
for speakers that you want to play deep bass
signals. Use the SMALL designation for speakers
that would benefit from having their bass sent to
more capable speakers. The bass management
system redirects bass information away from
all SMALL speakers and sends it to the LARGE
speakers and/or the SUBWOOFER. It may be
useful to think of LARGE as "full-range" and
SMALL as "high-pass filtered."
Four typical examples of the many possible
system configurations illustrate the principles
behind bass management:
• Five LARGE speakers and sub-
woofer: This system requires no bass
redirection. All five speakers play the normal
bass recorded in their respective channels.
The subwoofer plays only the LFE channel
bass. Depending on the soundtrack, there
may be minimal use of the LFE channel,
so the subwoofer would be under utilized.
Meanwhile the normal bass places higher
demands on the capabilities of the other
speakers and the amplifiers driving them.
• LARGE front, center, surround
speakers, no subwoofer. The normal
bass from the front, center, and surround
channels is played in its respective speak-
ers. With no subwoofer, the LFE bass is
redirected to all five LARGE speakers.
This places significant demands on these
speakers and their amplifiers, as they must
play their own normal bass plus the very
demanding LFE bass.
• All SMALL speakers and subwoofer.
The normal bass from all channels is redi-
rected to the subwoofer, which also plays
the LFE channel. The subwoofer handles ALL
of the bass in the system. This configura-
tion provides several benefits: deep bass
is played by the speaker most suited to do
so, the main speakers may play louder with
less distortion, and the need for amplifier
power is reduced. This configuration should
be used with bookshelf-size or smaller main
speakers. It should also be considered in
some cases with floorstanding front speak-
ers. This configuration is advantageous
when driving the system with moderate
power amplifiers.
• LARGE front speakers, SMALL cen-
ter and surround speakers, and
a subwoofer. The normal bass from
the SMALL center and surround speakers
is redirected to the LARGE front speakers
and the subwoofer. The LARGE front speak-
ers play their own normal bass plus the
redirected bass from the SMALL speakers
and LFE bass. The subwoofer plays the LFE
bass plus the redirected bass from all of
the other channels. This might be an ap-
propriate configuration with a pair of very
capable front speakers driven by a large
power amplifier. A potential disadvantage
with mixed LARGE and SMALL configura-
tions is that the bass response may not be
as consistent from channel to channel as
it might be with the all SMALL configura-
tion.
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NOTE: As an alternative configuration with
a satellite/subwoofer package as the front
speakers, follow the speaker manufacturer's
instructions, connecting the high-level inputs
of the powered subwoofer directly to the
front speaker outputs of the RSP-1068 and
connecting the satellites to the subwoofer's
own crossover. In this arrangement, the
speakers would be classified as LARGE
and the subwoofer setting would be OFF
for all surround modes. No information is
lost during playback because the system
redirects bass information to the front
LARGE speakers. While this configuration
ensures proper satellite speaker operation
by using the speaker's own crossovers, it
has some disadvantages in terms of system
calibration and would generally not be the
preferred configuration.

Speaker Setup

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The SPEAKER SETUP menu is used to config-
ure the RSP-1068 for use with your specific
loudspeakers and to determine the bass man-
agement configuration as described in the
previous overview. The menu is accessed from
the MAIN menu.
The following speaker options are available:
FRONT SPEAKERS (small/large): Use the
LARGE setting to have the front speakers play
low bass (full-range). Use the SMALL setting to
redirect normal bass away from these speakers
to a subwoofer (high-pass filtered).
CENTER SPEAKER(S) (large/small/
none): Use the LARGE position (not available
with SMALL front speakers) to have the center
speaker play low bass (full-range). Use the
SMALL position if your center channel speaker
has limited low frequency capability, or if you
prefer that the bass be sent to the subwoofer
(high-pass). Select the NONE setting if your
system does not have a center channel speaker
(the surround modes will automatically divide
all center channel information equally between
the two front speakers, creating a phantom
center channel).