Equalize Surround Channels - Film-Tech SA10 Installation Manual

4-2 / Alignment With CP200
4.4

Equalize Surround Channels

1. Set one of the preselect (A-D) lever switches to format 42 and then press that preselect
button.
2. Press the GO button.
3. On the SA10 front panel, press the Surround EX Mode switch to the Enable (out)
position.
4. On the inside of the SA10 front panel, press the Test/Normal switch to the Test (out)
position. The red LED on the front panel should go on, indicating that the SA10 is in
Surround EX mode.
5. Mute the CP200.
6. Remove the Cat. No. 141 from the last slot on the right in the processor unit and install a
Cat. No. 85 Pink Noise Generator into the slot.
7. Un-mute the CP200.
8. Turn on the switch C on the Cat. No. 85; this will send pink noise to the Ls channel.
Left Surround EQ
.05
.1
Ls = 80-85 dBC
2.0
.2 .4 .8 1.6 3.15 6.3
With a sound pressure level meter located in the
theatre, adjust the Left Surround output control
level on the SA10 to produce a reading of 80 to 85
dBC.
While observing the RTA connected to the
microphones in the theatre, adjust the bass controls
on the SA10 to produce a low-frequency response
as flat as possible.
The left-hand control sets the frequency range, and
dB
the right-hand control sets the level of boost or cut.
+10
+5
0
–5
–10
8.0
12.5 kHz