2.9.3.2 Amplifiers
The gain settings of all of the screen channel amplifiers and surround amplifiers should be
the same. If a particular amplifier requires a vastly different gain setting or operates
differently than the others, then it should be checked and repaired.
Check all of the amplifiers for distortion or noise.
Verify that the cooling fans are operating correctly and that the air vents are clean and free
from obstructions.
2.9.3.3 Auditorium
The auditorium should have all of the acoustic treatments installed prior to setting the EQ.
Any excessive noise from air conditioners, hallways or other sources should be minimized.
All theater seats must be installed. Remove any plastic coverings from chairs or speakers
prior to any EQ (B-chain) alignment.
2.9.4 Assign Channels on AP20
After installing the AP20 into the rack and connecting the cabling for inputs and outputs, the next step is
to assign channels.
The AP20 allows for custom defined channel names for the input channels. The input channels are
named through the Channel Names screen.
Menu (System) > Formats > Channel Profile > Channel Names
In general the default assignments must be preserved for the first 6 channels in order to maintain
compatibility with the HDMI input channel assignments, and with the Hearing Impaired output channel.
Default channel names are indicated in Table 9 below.
Figure 14. Channel Names Screen
When channel assignments are complete, you can eliminate the unassigned channels so they do not
appear on the main screen. Turn off the Vu indicator for unused channels.
Do this by simply clicking the cursor on the VU button. When the button is green that channel will be
displayed in the Home screen; when it is grey the channel is off and will not be displayed on the Home
screen.
AP20 Installation & Operating Guide
AP20 Installation and Operating Guide
Document # 9301H39200 Ver. 1.2
Page 33
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