DTS XD10P, Инструкция по установке и эксплуатации, Страница: 35 / 94

XD10P Cinema Audio Processor, Installation and Operation Version 1.0
Equipment Required:
•
SPL meter
•
Aux power supply (connected to XD10P)
Alignment Procedure:
1. Run an optical Pink Noise source (film) on the projector.
2. Set the Main Fader on XD10P to 7.0.
3. Place SPL meter in auditorium. Note the auditorium reading (for example, 85 dB) and record it.
4. Turn the Power switch OFF on the XD10P. This switches the unit to bypass mode and the
Bypass indicator will flash.
5. Read the new level on the SPL. For example, it might be up to 90 dB. It needs to be adjusted to
about 3 dB lower than the level recorded in step 3, above.
6. If necessary, adjust the trim pots on the Input module (Figure 3-16, below) for an SPL level that
is 3 dB lower than the level that was noted when the power switch was ON (step 3, above). For
example, turn Projector 1 potentiometer (on the left) to 82.
You will need to remove the front access panel to gain access to the Input module, which is on
the left side.
Do not rotate the Main Fader knob at this time or the bypass level will change.
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INPUT MODULE
Figure 3-16. Input module, Bypass Level trim pots (1 and 2)
1. Projector 1 Bypass Level Adjust
2. Projector 2 Bypass Level Adjust
This completes the calibration of the bypass level.
Note : When in bypass mode, the operator can change the bypass level by adjusting the Main
Fader. However, the Main Fader knob must be rotated many more turns, compared to non-
bypass mode, to achieve changes in level.
3.7.3. Optical Surround Gain and Delay
Depending on the size of the auditorium, there may be a delay between the screen channels and the
surround channels, to avoid an echo effect. This delay is to ensure that the sound from the back of the
theatre arrives at the listener’s ears approximately 20 milliseconds after the arrival of the front speaker
sound.
1. Calculate the surround delay by using the following formula:
a. Measure the distance from a selected rear seat to the nearest surround speaker (in feet). If
you are calculating in meters, multiply by 3 (m X 3) to convert to feet.
b. Measure the distance from the same rear seat to the nearest screen speaker (in feet).
c. Subtract the two measurements to find the difference, then add 20 to that number. The result
is the Surround Delay in milliseconds (mS).
3. Using XD10P Setup
Document #: 9301E855001.0 3-12