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 Y
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 pro-
grammed into factory presets.
Configure Inputs 1-8 for mic or line level using the LCD menu (See "Level" on
page 30) 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 31) or Conference Composer Control Software (See the Conference
Composer User Guide). Phantom power should be turned On for condenser and elec-
tret microphones.
When using the power on 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 Control (AGC)
meter on Conference Composer Software.
Software, go to the D
IAGNOSTICS
one 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 10 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 chan-
nel'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 the signal
because it is too low. For example, if the meter is showing an average gain of -15 dB,
15
I EF2280 I
NTEGRATING THE
S
OUR YSTEM
page. Watch the meter labelled AGC while some-
V
ORTEX
Y S
NTO OUR YSTEM
In the Conference Composer
EF2280 Reference Manual