Integrating The Ef2280 Into Your System; Input Settings; Calibration - Polycom Vortex EF2280 Reference Manual

I
NTEGRATING THE
Operating the
EF2280
I S
NPUT ETTINGS
Set Inputs 1-8 for
Mic or Line Level
Select Phantom
Power for Inputs
1-8
C
ALIBRATION
Set Mic/Line
Input Channel
Gains
© Polycom, Inc.
EF2280 I
NTO
The EF2280 can be operated in two ways: through the LCD menu on the front
panel or through RS-232. For control via RS-232, please refer to the EF2280
Programming Guide, which includes programming tips as well as the EF2280
RS-232 commands. For operation using the PC control software, Conference
Composer, please refer to the Conference Composer User Guide.
Use Conference Composer software to easily configure the EF2280 with a PC,
or refer to the Applications Guide for different configurations that are already
programmed into factory presets.
Configure Inputs 1-8 for mic or line level using the LCD menu (See "Level" on
page 23) or Conference Composer Control Software (See the Conference
Composer User Guide).
Turn phantom power On or Off for Inputs 1-8 using the LCD menu (See
"Phantom Power" on page 23) or Conference Composer Control Software
(See the Conference Composer User Guide). Phantom power should be
turned On for condenser and electret microphones.
When using the factory default, Preset 0, the following calibration can be
used.
In Preset 0, Automatic Gain Control (AGC) is On and the microphone gains on
Inputs 1-8 are set to 15 dB. The AGC will compensate for the microphone
gain. If you are using ceiling microphones, set the microphone gain to 28 dB.
Fine tune the Input Gain using the Automatic Gain Con-
trol (AGC) meter on Conference Composer Software.
the Conference Composer Software, go to the D
meter labelled AGC while someone is talking into the particular channel that
you are adjusting. Watch the number in the box at the bottom of the AGC
meter (See Figure 20 below). This is the amount of gain that the AGC is
applying. The goal is to have the AGC meter on average staying around 0. If
the level that you see in the box is negative, decrease the input gain by the
average number that you see in the box because the AGC is attenuating the
channel's input gain because the level is too high. If the number in the box is
positive, increase the input gain on that channel because the AGC is boosting
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I EF2280 I
NTEGRATING THE
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OUR YSTEM
IAGNOSTICS
V
ORTEX
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EF2280 Reference Manual