Test Tone - Rotel RSX-1550 Owner's Manual

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Note: The master crossover point can be overridden with a
custom crossover frequency for the front, center, surround, or
surround back speakers in the ADVANCED SPEAKER SETUP menu;
however, in most systems the single master crossover point should
work well
DOLBY DIGITAL:
DOLBY PLIIx:
DTS:
STEREO:
DSP:
MULTI INPUT:
These six lines allow you to override the master subwoofer level setting as
determined on the TEST TONE menu (see next section) for each specific
surround mode. When going to the SUBWOOFER SETUP menu from the
MAIN menu, the current surround mode is automatically highlighted.
Use the +/– buttons to adjust the subwoofer level for the current surround
mode. The options are OFF (which turns off the subwoofer for that mode)
and a range of adjustments from -9dB to +9dB and MAX (+10dB). A
setting of 0dB means that the specified surround mode will use the master
subwoofer level. Any other setting is an offset to the master setting. For
example, an adjustment of -2dB for a particular surround mode means
that the subwoofer level will be 2dB quieter than the master subwoofer
level when that surround mode is selected. Use these subwoofer level
settings to adjust the relative bass output of various surround modes.
Changing the master subwoofer level will increase or decrease the level
for all surround modes.
Note: Only the current surround mode can be adjusted on this
menu. You will need to change surround modes using the front
panel or remote buttons to adjust a different mode.
We recommend starting with the settings for all surround modes at the
default 0dB setting during the test tone calibration of the system and
for a period of familiarization after that. As you listen to a variety of
source material over time, you may notice that certain surround modes
consistently produce too much or too little bass from the subwoofer. If
so, then use these menu settings to customize each surround mode. In
general, if the master subwoofer level is set properly (i.e. not too loud),
individual settings for each surround mode should not be necessary.
Note: In Dolby Digital and DTS recordings, the LFE channel
is used to produce spectacular low bass effects, placing
considerable demands on your subwoofer system. If you hear
distortion or other signs of distress from your subwoofer at loud
listening levels, you may consider reducing the subwoofer level for
the Dolby Digital and/or DTS surround modes. In other surround
modes, there is no LFE channel and the subwoofer will only
reproduce redirected bass from the other channels, which is not as
likely to tax the subwoofer.
To return to the MAIN menu, press the ENTER button. Press the MENU/
OSD button on the remote to cancel the display and return to normal
operation.
RSX-1550 English v2.indd 46
RSX-1550 Surround Sound Receiver RSX-1550 Surround Sound Receiver

Test Tone

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This menu uses filtered pink noise test tones to set equal volume levels
for all speakers (left front, center, 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 surround sound material will
be reproduced as it was intended and is a critical step in calibrating 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 can be
in any surround mode except BYPASS with any input except the MULTI
INPUT. Enter the OSD 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 accordingly 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 speakers
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 are the same volume.
To return to the MAIN menu, press the ENTER button. Press the MENU/
OSD button on the remote to cancel the menu display and return to
normal operation.
Calibration with an SPL meter:
Calibrating the system with an SPL (Sound Pressure Level) 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 calibration level for all theaters
to ensure that soundtracks can be played at the volume level intended by
the director of the film. This reference level should result in spoken dialog
played at a realistic level for normal speech with the loudest peaks in any
single channel at about 105dB. The receiver's test tones are generated
at a precise level (-30dBFs) relative to the loudest possible digitally
recorded sound. At the Dolby or DTS reference level, these test tones
should produce a 75dB reading on an SPL meter.
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