Screen Speaker Systems
With #1 signal, track #2, 1000 cycles, read the signal level at the output of the center speaker power amplifier. (Bridging V. I. - 12 ohm calibration). This will be the reference signal level for the screen speaker systems. (The 3 gang fader and the amplifier gain control may be adjusted for the normal theatre operating level as the signal is 6 dB below 100% modulation).
With #2 signal, track #1, 800 cycles, read the output level at the left center speaker power amplifier and adjust its gain control for a level 1 dB below the center speaker reference level, With the same 800 cycle signal read the output level at the left speaker power amplifier and adjust its gain control for a level 6 dB below the center speaker reference level.
With #3 signal, track #3, 1200 cycles adjust the right center power amplifier output to reference signal - 1 dB and the right power amplifier output to reference signal level - 6 dB, similar to the signal #2 adjustment above.