JBL SYNTHESIS SDP-45 User Manual

JBL SYNTHESIS SDP-45 User Manual Manual pdf 37 page image

JBL SYNTHESIS SDP-45 Setup- 37 -TESTS and TEST OPTIONS INTERNAL NOISE TEST:Selecting NOISE TEST will put a burst of pink noise, sequentially, on allspeakers while displaying the output the test signal is being sent to. Thisis intended to help you verify that the connections and speaker levels arecorrect.If you are using the SDP-45 with a JBL Synthesis Systemincluding the JBL Synthesis SDEC Digital EQ / Speaker Processor thenyou should always leave the Levels set to 0dB (default) for all speakersunless directed by Technical Support to do otherwise. Only use theNOISE TEST to test and adjust the speaker outputs through the JBLSynthesis SDEC and A.R.C.O.S. Calibration software.The test tone by default is a band limited from 500Hz to 2000Hz with12dB per octave roll-offs above and below those frequencies. This bandlimited test tone is best used for setting output level of speakers whenusing an SPL meter.The test tone frequency range can be changed to a full range 20Hz to20kHz pink noise tone from the SYSTEM SETUPMISCELLANEOUSmenu. The full range test tone will be output regardless of bassmanagement crossover or speaker size selection. This full range test isbest used for testing speakers for proper operation including possiblewoofer or ultra-high frequency driver. Care must be taken when using thefull range test tone as speakers not designed to play all frequencies maybe damaged. PROCEED WITH CAUTION!TURNING ON THE TEST TONE FROM THE FRONT PANEL MENU:Within the System Setup  Test menu, move the cursor to selectNOISE TEST and press the right arrow button to initiate the test (andthe left arrow button to stop it, if desired). This menu can also beaccessed by pressing the TEST button on the remote.When operated from the TEST MENU The AUTOCYCLE willcontinue until the LEFT arrow is pressed to exit or five (5) completecycles have occurred.To change from AUTO-CYCLE to MANUAL press the RIGHT arrowbutton again. Once in MANUAL mode to advance the channel frompress 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 TESTbutton on the remote. To change from AUTO-CYCLE to MANUALpress the TEST button again. To advance the channel from theremote press right arrow again. To exit press left arrow button.When operated from the REMOTE CONTROL the test tone will stopafter one complete cycle through the channel outputs.ADJUSTING THE OUTPUT LEVEL:The first 8 seconds of the test will allow you to adjust the MAINoutput level to reference level by using the LEFT FRONT speaker asthe reference. The test tone is designed so that a 0dB reading on anSPL meter that is set to C-weighting and SLOW response willcorrelate with the THX reference level of 75dB, however the test tonelevel can be set using any convenient SPL level.By default the test tone will appear at the current MAIN output levelcontrol setting. Using the LEFT FRONT speaker adjust the mainoutput level until you achieve the desired level on your SPL meter.The front left speaker will always read 0dB. The front left speaker isused as the ―reference‖ speaker so that all adjustments are relativeNOTE