
a. Setting Room Equalization
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12 |
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| 242 |
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| mono eq |
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| mono |
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| gain |
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| R |
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| L |
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| signal | C |
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| present R |
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| gnd |
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| L |
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| FF |
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| C | O |
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| test |
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| points R |
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| L | Dolby |
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| gain | C |
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| R |
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13 | REPEAT 11 | → 12 |
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| mono eq |
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| mono |
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| gain |
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| signal | C |
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| present R |
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| gnd | FF |
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| O | 0 |
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| 8 | 7 | 60 | 50 | 4 |
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| test | C |
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| points | R |
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| Dolby |
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| gain | C |
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| mono eq |
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| mono |
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| gain |
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| R |
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| L |
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| signal | C |
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| present R |
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| Ls | OFF |
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| gnd |
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| 80 | 70 |
| 0 | 50 | 0 | 3 | ||
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| test | C |
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| points | R |
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| Ls | Dolby |
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| gain | C |
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| R |
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a. Setting Room Equalization
Notes
With a sound pressure level meter located at the position in the theatre used for step 6, adjust the center channel gain on the Cat. No. 242 card until the channel produces a reading of
Repeat steps 11 and 12 for the left and right channels. Switch on the appropriate pink noise switch on the Cat. No. 85C pink noise generator, one channel at a time.
Compare the response displayed on the real time analyzer (RTA) for each channel (L, C, R). All should show a similar shape. Any large differences indicate faulty or misaligned crossovers or defective speakers. Speaker phasing could also be at fault. See Appendix A.