ROTEL Surround Sound Receiver RSX-1055 - Manual (Page 31)

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NOTE
: Generally the MAX setting (sometimes
called “plus” or “double” bass) would not be
used in systems with a capable subwoofer.
Duplicating bass in LARGE speakers and the
subwoofer can introduce room cancellation
problems and make proper subwoofer level
calibration difficult. If you need more bass
output, a better option would be to use the
normal YES setting and experiment with cor-
ner placement of the subwoofer.
CB SPKR SELECT (1 speaker/2 speak-
ers): Use the 1 SPEAKER setting if your sys-
tem has a single center back surround speaker.
Use the 2 SPEAKERS setting if your system has
2 center back surround speakers. If your sys-
tem does not have any center back speakers,
select NONE on the previously described
CENTER SPEAKER setting on this menu.
NOTE : Speaker configuration is a global set-
ting for all surround modes and need only be
done once.
To change a setting, place the highlight on the
desired line using the UP/DOWN buttons and
use the +/– buttons to toggle through the
available settings. To return to the MAIN menu,
press the ENTER button. Press the MENU key
on the remote to cancel the display and re-
turn to normal operation.
TEST TONE Menu
TEST TONE
LEFT: 0dB
CENTER: 0dB
RIGHT: 0dB
R SURROUND: 0dB
CENTER BACK: 0dB
L SURROUND: 0dB
SUBWOOFER: 0dB
ENT KEY=MAIN MENU UP KEY=up
+/– KEY=change DWN KEY=down
This menu uses pink noise test tones to set equal
volume levels for all speakers (left front, cen-
ter, right front, right surround, center back, left
surround, and subwoofer) to ensure proper
surround sound reproduction. Setting the output
levels using the test procedure provides the
most accurate adjustment so that digital sur-
round sound material will be reproduced as
it was intended and is a critical step in cali-
brating the system.
NOTE
: If you have configured your system to
use two center back speakers, there will be
an additional line in the menu, giving you the
ability to independently adjust the CENTER
BACK 1 and CENTER BACK 2 speakers.
To access this menu and perform the test tone
calibration, you must be in one of the surround
modes. To do this, press any of the MODE buttons
except 2CH. Then, enter the ON-SCREEN DIS-
PLAY menu system and select TEST TONE from
the MAIN menu to reach this screen.
When you enter the TEST TONE menu, you
will hear a test tone coming from the highlighted
speaker. Highlight different speakers by moving
the cursor to the desired line using the UP/
DOWN buttons. The test tone will shift accord-
ingly to the selected speaker.
Seated in the normal listening location, shift
the test tone to the various speakers. Using the
one speaker as a reference, listen for any speak-
ers that are noticeably louder or quieter. If so,
adjust that speaker’s levels up or down (in 1dB
increments) using the +/– buttons. Continue
switching among the speakers and adjusting
until all speakers are the same volume.
To return to the MAIN menu, press the EN-
TER button. Press the MENU key on the remote
to cancel the menu display and return to nor-
mal operation.
Calibration with an SPL meter:
Calibrating the system with an SPL meter, rather
than by ear, provides more precise results and
improves the system’s performance significantly.
Inexpensive SPL meters are widely available
and the procedure is quick and easy.
Both Dolby and DTS specify a standard cali-
bration level for all theaters to ensure that
soundtracks can be played at the volume level
intended by the director of the film. This ref-
erence level should result in spoken dialog
played at about 80 dB (a realistic level for nor-
mal speech) with the loudest peaks in any single
channel at about 105 dB.
This calibration can be done in a home the-
ater using a sound pressure level (SPL) meter
and the pink noise test tones described above.
Set the meter to its SLOW response with C-
weighting and hold it away from your body
at your listening position (mounting the SPL
meter on a camera tripod makes this easier).
You can either point the SPL meter at each
speaker as it is being measured or leave the
meter in a fixed position pointing at the ceil-
ing.
Increase the master volume control on the
RSX-1055 until the meter reads 75dB when
playing the test tone through one of the front
speakers. Then, use the individual channel ad-
justments on the TEST TONE menu to adjust
each of the individual speakers, including the
subwoofer, to the same 75dB on the SPL meter.
NOTE
: Due to meter weighting curves and
room effects, the actual level of the subwoofer
may be slightly higher than you measure. To
compensate, Dolby suggests setting the sub-
woofer several dB lower when calibrating
with an SPL meter (i.e. set the subwoofer to
read 72 dB on the meter instead of 75 dB).
Avoid setting the subwoofer level too high.
Exaggerated bass effects come at the expense
of proper blending with the main speakers. If
you can localize bass from the subwoofer,
the subwoofer level is probably too high.
Remember the setting of the master volume con-
trol used during this calibration. To play a Dolby
Digital or DTS soundtrack at the reference vol-
ume level, simply return to that volume setting.
The idea of a reference volume setting to be
used in every theater has its merits. However,
many home theater listeners find this setting
to be excessively loud. Let your own ears be
the judge for deciding how loud to playback
movie soundtracks. Regardless of your listen-
ing levels, using an SPL meter to calibrate equal
levels for all speakers in the system is well worth
the effort.
DELAY SETUP Menu
DELAY SETUP
Dolby D Dolby
/DTS Pro LogicII
CENTER: 1ms
R SURROUND: 15ms 25ms
L SURROUND: 15ms 25ms
CNTR-BACK: 15ms 25ms
ENT KEY=MAIN MENU UP KEY=up
+/– KEY=change DWN KEY=down
This menu, which is reached from the MAIN
menu, allows you to set the delay for individual
speakers. This ensures that the sound from each
speaker arrives simultaneously at the listening
position, even when the speakers are not all
placed at equal distances from the listener.
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