USL JSD-60 Manual - Manual (Page 40)

Page 40
a. On the equalizer tab, select the center channel.
b. Set the gain control at the far left of the equalizer to minimum.
c. Set the main fader to 0.0.
d. Press the Flatten button.
e. Press Pink and Generator to drive the center channel with pink noise.
f. Adjust the main fader towards 7.0 without exceeding 85dB SPL in the auditorium.
g. Adjust the gain control at the far left of the equalizer tab to yield 85dB SPL in the auditorium as measured
with a reference SPL meter.
h. Press the Mic Cal button to bring up the microphone calibration dialog box.
i.
Adjust the Microphone Gain control in the microphone calibration dialog box until the JSD SPL
measurement agrees with the reference SPL meter reading.
j. If desired, press the Save button to save this microphone calibration in a file. The use of the microphone
model number and serial number(s) as a filename is suggested.
k. Press the Generator button again to turn off the generator.
5. Press Auto EQ to automatically equalize this channel. The Auto EQ sequence will put up messages showing the
progress of the equalization.
6. Select the next channel to be equalized and press Auto EQ again. Repeat this until all channels are equalized.
8.11.4 Manual Equalization
A suggested procedure for equalizing a channel is listed below. Your theater may use a modified or different
procedure. If an external pink noise generator is to be used with the internal RTA, enable the internal pink noise
generator, then disable it. Enabling the internal pink noise generator configures the internal RTA for proper
operation.
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:
a. On the equalizer tab, select the center channel.
b. Set the gain control at the far left of the equalizer to minimum.
c. Set the main fader to 0.0.
d. Press the Flatten button.
e. Press Pink and Generator to drive the center channel with pink noise.
f. Adjust the main fader towards 7.0 without exceeding 85dB SPL in the auditorium.
g. Adjust the gain control at the far left of the equalizer tab to yield 85dB SPL in the auditorium as measured
by a reference SPL meter.
h. Press the Mic Cal button to bring up the microphone calibration dialog box.
i.
Adjust the Microphone Gain control in the microphone calibration dialog box until the JSD SPL agrees with
the reference SPL meter.
j. If desired, press the Save button to save this microphone calibration in a file. The use of the microphone
model number and serial number(s) as a filename is suggested.
k. Press the Generator button again to turn off the generator.
5. Press Flatten to load a starting point equalization unless another channel was copied to this one.
6. Turn the main fader and Gain control (on the left side of the Equalizer tab) all the way down.
7. Press the Pink Noise and Generator buttons to turn on pink noise in the auditorium.
8. Adjust the main fader towards 7.0 without exceeding the desired SPL in the auditorium (typically 85dB for
screen channels and 82dB for surround channels).
9. Adjust the Equalizer tab Gain control for the desired SPL.
10. Position the cursor in the RTA graph area to make additional controls visible. Adjust the Data Offset and X-
Curve controls to place the mid-band RTA levels within the curve limit lines.