JBL SYNTHESIS SDP-40 - Manual (Page 78)

SETUP
SDP-40
3-38
Note:
The internal noise and DACS CALIBRATON modes
will turn on TRIGGER1 .
DACS CALIBRATION
Selecting DACS CALIBRATION accesses the SPEAKER LEVEL ADJUST
menu (pictured on page 3-36).
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
DACS CALIBRATION LEVELS CALIBRATION MANUAL SPEAKERS SETUP
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.
Before making adjustments, set the SPL meter according to the
DACS® Installers Manual or audio calibration disc instructions. If no
setting is recommended, set the SPL meter to “C” weighting and
“SLOW” response. Use the up and down MENU arrows to
manually scroll through menu items. 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 the appropriate reading on the SPL
meter from the primary listening position. Press the left MENU
arrow to exit the selected output and return to the SPEAKER LEVEL
ADJUST menu.
Note:
SDP-40 Balanced output levels must be recalibrated
when output connections are changed from
unbalanced to balanced or vice versa. The balanced
outputs are approximately 6dB louder than the
unbalanced outputs.
Input Source Listening Mode
PLII MOVIE 2-Channel
Dolby Digital
dts(-ES)
5.1-Channel Analog
DIGITAL*
5.1a STANDARD
*
* These listening mode names differ depending on the current input source,
speaker setup, and parameter settings. Refer to the Listening Mode
Descriptions section that begins on page 5-5 for more information.