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The SETUP Menu
SDP-40
LEVEL ADJUST menu. The cursor will automatically scroll through
the menu highlighting each output as it is tested. Each output is
tested for approximately 4s. It is possible to manually select a
speaker just as the unit is about to automatically scroll to the next
speaker, causing the unit to send the noise signal to both outputs.
If this occurs, reselect the desired speaker.
The calibration noise will pass briefly through the SUB R output
when the SUB L/R parameter on the CUSTOM SETUP or
SYNTHESIS 7CH SETUP menu is set to MONO, or the SUB RIGHT
parameter on the SPEAKER LEVELS ADJUST menu is manually
selected during the test.
Before making adjustments, set the SPL meter to “C” weighting
and “SLOW” response. Use the up and down MENU arrows to
temporarily interrupt automatic scrolling and manually select an
output. Press the right MENU arrow to select an output for
adjustment, then use the up and down MENU arrows to increase
and decrease the level of the selected output in 0.5dB increments
within a range of -18 to +12dB. Adjust all output levels to achieve
a 75dB reading on the SPL meter from the primary listening
position. Press the left MENU arrow to exit the selected output and
resume automatic scrolling.
Note:
Speakers that are set to NONE on the CUSTOM
SETUP menu cannot be adjusted during the
INTERNAL NOISE TEST. These speakers can be
adjusted during DACS CALIBRATION, but this is not
recommended.
DACS CALIBRATION
Selecting either INTERNAL NOISE TEST or DACS CALIBRATION
accesses the SPEAKER LEVEL ADJUST menu (pictured on the
previous page).
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. As the noise test is
conducted, the SDP-40 loads the DOLBY Pro Logic II, Dolby Digital,
or dts(-ES) utilizing the signal from the DACS® calibration system
or audio calibration disc.
For example, if an analog or PCM input type is coming into the unit
when DACS CALIBRATION is conducted, the unit will activate the
DOLBY Pro Logic II listening mode. If a Dolby Digital input type is
coming in, the unit will activate the DOLBY DIGITAL listening
mode. And if a dts(-ES) input type is coming in, the unit will acti-
vate the dts(-ES) listening mode. When DACS CALIBRATION is
selected, these listening modes will retain their factory-default
settings. The unit will temporarily disregard customized listening
mode settings.
For system optimization using DACS® and a JBL Synthesis Digital
Equalizer, connect the left and right RCA outputs of the DACS®
signal generator (EVP-1) to the #1 analog input (which is active in
the TAPE input) and set the front panel volume level to 0dB. This
will provide the correct signal path and reference output level.