Datasat AP25 - Page 70

AP25 Installation and Operating Guide Page 70
AP25 Installation & Operating Guide Document # 9301H79500 Ver. 1.00
Global audio delay for current format: Audio can be delayed for a selected format, if
necessary, to synchronize with a digital video projector. Use the adjustment knob to adjust
the audio delay. Delay values increase by 1 ms increments up to a maximum of 1 second.
Surround Delay: Enter the desired delay, in milliseconds, up to a maximum of 100 ms.
Select the Surround Delay box and then dial in the correct value using the front panel
adjustment knob. The surround delay is applied to the internal channels 5,6,7 and 8.
H.I. (Hearing Impaired) Delay: Audio can be delayed on the Hearing Impaired output
channel. Enter the desired delay, in milliseconds, up to a maximum of 220 ms.
Surround Offset: Use the adjustment knob to adjust between -10 dB to +10 dB offset in
increments of 0.5 dB.
Format Trim: This may be used to apply volume level trim to the current format. This may
be used in a case where you want to balance the volume level of two different sources. The
difference between using the Format Trim and the Format Fader feature is that the Format
Trim allows you to change the master fader level and keep the relative levels balanced.
Format Trim may be entered in 0.5 dB increments from 0 dB to -10 dB.
Fade In/Fade Out: During a format change, the Fade In and Fade Out period can be up to
5 seconds in increments of 20 ms. Use the adjustment knob to set.
Changes happen real-time. To discard a changed setting, you must set it back to where it was
prior to the change.
4.3.6.1.1. Calculating the Surround Delay
Sound
from the back of the theater should arrive at the listener’s ears approximately 20 ms
after the arrival of the front speaker sound. The following procedure describes how to arrive
at the correct surround delay setting.
 Measure the distance between a rear seat and the nearest surround speaker in feet. If
calculating in metric, convert meters to feet by multiplying by 3.
 Measure the distance from the same rear seat to the nearest screen speaker. If
calculating in metric, convert meters to feet by multiplying by 3.
 Subtract surround distance from the screen distance, and add 20 (screen - surround + 20).
The result is the surround delay in milliseconds.
 After setting the surround delay in the AP25, verify the setting by listening to a familiar
soundtrack. The action on-screen should match sound in the auditorium.