USL JSD-60 Manual - Manual (Page 30)

Page 30
serial number. The RTA gain setting required for the proper SPL
indication is saved. See Appendix E for information on the
microphone calibration file format.
Equalizer Copy
Press this button to copy equalizer settings from one channel to
another. Choose the source and destination, and then click the
Copy button that appears. The destination channel can be more
than a single channel.
Generator
Press the Generator button to turn the generator on or off. Use
the adjacent Pink, 100Hz, 1kHz, 10kHz, and Sweep buttons to select the type of generator output. Auditorium
equalization typically uses pink noise. When the generator is enabled, the format changes to 8 channel digital and
the channel filters are turned off.
Auto EQ
The JSD-60 includes automatic equalization for all channels except LFE. See section 8.11.3 for instructions on
operating the auto EQ feature of the JSD-60. A description of the system is included here.
Auto EQ is not enabled until the RTA microphone has been calibrated or a microphone calibration file has been
loaded. Once the microphone is calibrated and a channel is selected, the Auto EQ goes through the following
process:
1. Select digital 8 input.
2. Disables the channel filter.
3. Set equalizer to flat.
4. Adjust main fader to 0.0.
5. Adjust channel output trim to -20dB.
6. Listen for quiet. Abort if SPL too high (room not quiet).
7. Turn on pink noise.
8. Increase main fader towards 7.0 while ensuring the SPL does not exceed the SPL equalization will be run at
(EQSPL in the AutoEQ.ini file, typically 80dB).
9. Adjust output trim up until SPL reaches target. Abort if trim increase does not result in SPL increase.
10. Normalize RTA data to place majority of RTA bands within limit curves.
11. Adjust equalizer as required to put all bands at desired RTA level.
12. Smooth equalizer settings to avoid large transitions between adjacent bands while keeping RTA data within
limits.
13. Adjust output trim to target SPL. The target SPL is specified in AutoEQ.ini as StageSPL and SurroundSPL,
typically 85dB and 82dB, respectively.
14. The pink noise is left on to allow final manual adjustments.
Flatten
Press this button to return the equalization to flat (all bands at 0dB).
Curve File
Press this button to load a curve file from the “Documents/ USL/JSD-60/EQ Curves” directory. The installer placed
several curve files for different sized auditoriums in this directory. Current practice is to use one of the X-Curve
files, based on auditorium size. If a custom equalization curve is required, use one of the existing files as a template
to create new curve limit file using a text editor. See Appendix E for the Curve File Format.