Dolby Laboratories CP500-300 Specifications download pdf (Page 79)

SECTION 8

FINAL ADJUSTMENTS

8.1 Setting Optical Surround Delay

The CP500 incorporates a delay line in the surround channel to ensure that sound

from the rear of the theater arrives at the listeners’ ears approximately 20

milliseconds after the arrival of sound from the front speakers. The delay is set into

CP500 memory using the front panel knob. Use the following formula to calculate

the correct delay setting:

1. Estimate the distance between a rear seat and the nearest surround loudspeaker,

in feet. If the metric system is used, convert the distance from meters to feet by

multiplying by three (3).

2. Estimate the distance from this seat to the front loudspeakers, in feet. If the

metric system is used, multiply the distance by three (3) to convert distance

from meters to feet.

3. Subtract the distance measured in step 1 above from the distance measured in

step 2, then add 20. The result is the delay time, in milliseconds.

For example:

The selected seat is 10 feet (3.3 meters) from the surround speakers.

The selected seat is 80 feet (26.7 meters) from the front speakers.

The delay is set for (80-10) + 20 = 90 milliseconds.

Next, enter the desired delay time into

CP500 memory:

Press the MENU key.

Choose Alignment (SK2).

(A system password may be required at this point.)

Then, press Optical Surround Delay

(SK6).

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Dolby Laboratories CP500-300 Specifications Page 79