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Setup JBL
3-44
DACS CALIBRATION
Selecting the LEVELS CALIBRATION menu DACS CALIBRATION
option opens the SPEAKER LEVEL ADJUST menu shown on
page 3-42, which manually calibrates the output levels.
DACS CALIBRATION requires an external noise source. In JBL
Synthesis systems, this source is the JBL Digital Acoustical
Calibration System (DACS
®
). However, an alternate source such as
an audio calibration disc can also be used. When the noise test is
conducted, the SDP-40HD activates a listening mode based on the
current Main Zone input source. Refer to the table below for more
information about external noise test listening mode activation.
When a listening mode is activated during the DACS CALIBRATION
test, all custom listening mode menu parameter settings are
ignored. The listening mode is applied to the current Main Zone
input source in its factory-default condition. When the DACS
CALIBRATION test is finished, the listening mode returns to its
custom condition.
Note:
When the DACS CALIBRATION test begins, the SDP-40HD
automatically sets the volume level to +0dB. Avoid adjusting the
master volume level while the test is in progress to achieve THX
reference levels (75dB).
To manually calibrate output levels during the DACS calibration:
1. Set the SPL Meter to “C” weighting and “SLOW” response.
2. Place the SPL Meter at the primary listening position.
3. Press the or arrow button to highlight the output level
parameter you want. Then, press the button to select this
output level parameter. The horizontal bar graph shown on
page 3-42 displays.
4. Begin playback of the external calibration source and press the
or arrow button to select the output level that achieves
the SPL Meter reading specified in the external calibration
source instructions.
5. After selecting the output level, press the arrow button to
close the horizontal bar graph.
6. Repeat steps 2, 3, and 4 until you have set all the output levels
you want.
* These listening modes depend on the speaker configuration. Dolby Pro Logic IIx MOVIE
will only load when side and rear speakers are present.
**These listening mode names differ depending on the current input source, speaker
setup, and parameter settings. Refer to the Listening Mode Descriptions section
beginning on page 5-5 for more information.
SPEAKERSSETUP
LEVELS CALIBRATION
DACS CALIBRATION
INPUT SOURCE LISTENING MODE
2-Channel
PLII MOVIE, PLIIx MOVIE*
Dolby Digital
DIGITAL**
DTS(-ES)
*
5.1-Channel Analog 5.1mc STANDARD