JBL Synthesis SDP-45 4K - Manual (Page 40)

JBL SYNTHESIS SDP-45
Setup
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SPEAKER SIZE
If you are using the SDP-45 with a JBL Synthesis System
including the JBL Synthesis SDEC Digital EQ / Speaker Processor then
you should always set the Speaker Size to small and the Crossover set
to 80hz (default) for all speakers unless directed by Technical Support to
do otherwise.
Speaker configuration involves declaring the size such as Large, Small
or None (see SPEAKER SIZE menu) for the five categories of speakers:
Front (Left and Right), Center, Surround (side surround), Back (rear
surround) and Subwoofer (in SUBWOOFER sub-menu).
The Subwoofer output carries a combined (sum) contents of bass
extracted from all the other speaker channels, for those speakers that
are declared as ―Small‖, and also includes the Low-Frequency Effect
contents (LFE) present optionally only in the multi-channel stream
(labeled as 5.1, 6.1 or 7.1). Bass contents is defined as the portion of the
audio spectrum of frequencies from all the channels that are below the
cross-over frequency (default is 80Hz), added up to the LFE channel (if
present). The cross-over frequency can be modified in the SOURCE
SETUPCROSSOVER Fc submenu, separately for the front speakers,
center, surround and back. The LFE channel cannot be altered or cut off
and the cross-over frequency setup or Xtra Bass setup does not affect it.
Bass content carried through those channels where the speakers are
declared as ―Large‖ is not re-routed through the Subwoofer. Instead it is
output through those speakers directly. If Subwoofer is declared as not
present, then the bass contents from all the channels will be re-routed
through the large speakers only (if there are any), otherwise it will be cut-
off. SDP-45 provides a single subwoofer channel.
Parameter Possible Settings
FRONT LARGE, SMALL
CENTER LARGE, SMALL, NONE
SURROUND LARGE, SMALL, NONE
BACK 1 LARGE, 2 LARGE, 1 SMALL, 2 SMALL, NONE
SPEAKER LEVEL
If you are using the SDP-45 with a JBL Synthesis System
including the JBL Synthesis SDEC Digital EQ / Speaker Processor then
you should always leave the Levels set to 0dB (default) for all speakers
unless directed by Technical Support to do otherwise.
YOU MUST ENTER THE SAME SETTINGS FOR EACH SOURCE OR
REPEAT THIS PROCESS FOR EACH SOURCE WHEN THE SDP-45
IS SET TO SOURCE INDIVIDUAL.
Volume level corrections (from -12 to +12dB) can be entered for each
speaker individually in the SPEAKER LEVEL screen. This level control
can also be changed during the internal noise test as shown in the
SYSTEM SETUPTEST screen, or by pressing the TEST button on the
remote control.
SETTING SPEAKER LEVEL USING THE INTERNAL NOISE TEST:
The internal noise test allows you to set the levels of the speakers. The
noise test is used to balance the speakers relative to each other.
Note the following:
You should use a Sound Pressure Level (SPL) meter to
manually calibrate output levels. An SPL meter is a device that
measures the relative loudness of the speakers to ensure
accurate output level calibration. SPL meters are available at
Radio Shack.
Output levels should be calibrated from the primary listening
position by placing the SPL meter at the approximate location
where the
listener‘s head will be during listening.
The SUBWOOFER level will need to be adjusted higher then the
main speakers. This is due to the roll-off that all SPL meters
have built in to the microphone. Unless you are using a known
SPL meter with frequency response to below 30Hz do not set the
levels to the same as the Main Speakers.
The SDP-45 will return to the main Volume Level when the test
is exited.
NOTE
NOTE