USL JSD-60 Manual - Manual (Page 39)

Page 39
noise generator, then disable it. Enabling the internal pink noise generator configures the internal RTA for proper
operation.
1. Ensure that the proper speaker configuration biamp is selected by the Channel Config button.
2. Position the RTA microphone in the auditorium as specified by SMPTE ST 202:2010 (about 2/3 of the way back
from the screen and 2/3 of the way from a side wall of the auditorium). The microphone is normally 1.0 to 1.2
meters (3.3 to 4.0 feet) from the floor, or “ear level” for a typical audience member.
3. Plug the microphone in to the microphone input.
4. On the Outputs tab, slide all the level controls to minimum level.
5. Turn the power amplifier gains all the way down.
6. Set the JSD-60 fader to 7.0.
7. Under the Crossovers tab, press the Speaker button and select the desired speaker from the speaker library.
8. Under the Outputs tab, select pink noise and press the Gen button for the left channel.
9. Turn up the amplifier gains as far as possible without exceeding 85dB SPL in the auditorium.
10. On the Crossovers tab, press the View button to make the RTA display visible.
11. Adjust the Data Offset control (becomes visible when the cursor is over the graph area) until the RTA results
become visible on the RTA display.
12. Adjust the band gains as necessary for the flattest RTA response possible.
13. If there appears to be a notch in the response at the crossover frequencies, try pressing an Invert button to
switch the phase on a band.
14. Press Copy and copy the crossover settings to each of the other screen channels.
15. Go back to the Outputs tab, turn off the generator on the left channel and turn it on for the next channel.
Repeat the above process for each channel.
16. Apply an external pink noise source to left, center, or right channels of a JSD-60 input. This may be an AES/EBU
generator such as the USL DAT-100, an analog pink noise generator, or test content that has pink noise.
17. Set the rear panel DIP switches according to the following table:
18. Turn off the main power to put the JSD-60 into bypass operation. Note that the bypass power supply is
required for bypass operation.
19. Use the rear panel trim pots to adjust the low and high band gains as required for a relatively flat response as
shown on an external RTA. Remember that the front panel fader also adjusts the overall output level, so it
may be necessary to adjust that control.
20. Take the system out of bypass by turning the main power switch on.
8.11.2 Auditorium Equalization
The JSD-60 allows auditorium equalization to be completed automatically or manually using its precision internal
RTA. Prior to executing equalization, set the channel output trims in the outputs tab to -20 for each output
channel.
8.11.3 Automatic Equalization
1. Connect four microphones to a microphone multiplexer such as the USL MMP-10. Position the microphones as
specified in SMPTE 202-2010 sections 5.2 and 5.3.
2. Connect the microphone multiplexer output to the microphone input of the JSD-60.
3. On the Equalizer tab, press the Curve File button and select the appropriate curve file (such as x-curve 150
seats.ini). This sets the limit lines on the RTA display.
4. Press Mic File to load a previously generated microphone calibration file, or calibrate the microphones as
described below:
Speaker Configuration SW1 SW2 SW3 SW4
Biamp 330Hz crossover ON ON OFF OFF
Biamp 1kHz Crossover OFF OFF ON ON
Full Range OFF OFF OFF OFF