JBL Synthesis SDP-45 4K - Manual (Page 37)

JBL SYNTHESIS SDP-45
Setup
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TESTS and TEST OPTIONS
 
INTERNAL NOISE TEST:
Selecting NOISE TEST will put a burst of pink noise, sequentially, on all
speakers while displaying the output the test signal is being sent to. This
is intended to help you verify that the connections and speaker levels are
correct.
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. Only use the
NOISE TEST to test and adjust the speaker outputs through the JBL
Synthesis SDEC and A.R.C.O.S. Calibration software.
The test tone by default is a band limited from 500Hz to 2000Hz with
12dB per octave roll-offs above and below those frequencies. This band
limited test tone is best used for setting output level of speakers when
using an SPL meter.
The test tone frequency range can be changed to a full range 20Hz to
20kHz pink noise tone from the SYSTEM SETUPMISCELLANEOUS
menu. The full range test tone will be output regardless of bass
management crossover or speaker size selection. This full range test is
best used for testing speakers for proper operation including possible
woofer or ultra-high frequency driver. Care must be taken when using the
full range test tone as speakers not designed to play all frequencies may
be damaged. PROCEED WITH CAUTION!
TURNING ON THE TEST TONE FROM THE FRONT PANEL MENU:
Within the System Setup  Test menu, move the cursor to select
NOISE TEST and press the right arrow button to initiate the test (and
the left arrow button to stop it, if desired). This menu can also be
accessed by pressing the TEST button on the remote.
When operated from the TEST MENU The AUTOCYCLE will
continue until the LEFT arrow is pressed to exit or five (5) complete
cycles have occurred.
To change from AUTO-CYCLE to MANUAL press the RIGHT arrow
button again. Once in MANUAL mode to advance the channel from
press the right arrow again. To exit press left arrow button.
TURNING ON THE TEST TONE FROM THE REMOTE CONTROL:
To use the SDP-45 remote control to initiate the test press the TEST
button on the remote. To change from AUTO-CYCLE to MANUAL
press the TEST button again. To advance the channel from the
remote press right arrow again. To exit press left arrow button.
When operated from the REMOTE CONTROL the test tone will stop
after one complete cycle through the channel outputs.
ADJUSTING THE OUTPUT LEVEL:
The first 8 seconds of the test will allow you to adjust the MAIN
output level to reference level by using the LEFT FRONT speaker as
the reference. The test tone is designed so that a 0dB reading on an
SPL meter that is set to C-weighting and SLOW response will
correlate with the THX reference level of 75dB, however the test tone
level can be set using any convenient SPL level.
By default the test tone will appear at the current MAIN output level
control setting. Using the LEFT FRONT speaker adjust the main
output level until you achieve the desired level on your SPL meter.
The front left speaker will always read 0dB. The front left speaker is
used as the ―reference‖ speaker so that all adjustments are relative
NOTE