Polycom Vortex EF2241 Reference Manual page 16

Verify Room Gain
Configure
Program Audio
Sources
V EF2241 Reference Manual
ORTEX
Configure the matrix mixer input from the codec output.
gain of the matrix mixer should be set to match the nominal output level of the codec.
For example, if the codec outputs a -10 dBV (-8 dBu) level, 8 dB of gain should be
applied on the matrix mixer input. This will bring the codec level up to 0 dBu inside
the matrix.
After adjusting the loudspeaker level, verify the room gain in your system using the
R G meter on the D
OOM AIN
Gain measurement is only accurate when just the remote talkers are speaking. If local
talkers are speaking too, the room gain meters are not accurate. See Figure 8 below.
The meter shows the room gain, which is the relative level of the output level and the
input level. While the EF2241 will operate in positive room gain conditions, the
room gain should be around 0 dB or a negative value. If you have a positive room
gain, make adjustments in the following areas:
1. Decrease the Input Gain of the microphone.
2. Decrease the Output Gain of the microphone.
3. OR adjust the placement of the microphone relative to the loudspeaker.
Figure 8. Room Gain Meter on the Diagnostics page of the Conference Composer
control software.
Set the gains on the matrix mixer inputs from the program audio sources so that pro-
gram audio is played into the room at a level similar to that of speech from the remote
site. This should also ensure that the program audio levels are good when sent to the
remote site.
14
page of Conference Composer. The Room
IAGNOSTICS
Room Gain Meter
Read Room Gain
from here
Technical Support: 800.932.2774
I
NSTALLATION
The input