Polycom EF2241 - Manual (Page 16)

I
NSTALLATION
V ORTEX EF2241 Reference Manual 14 Technical Support: 800.932.2774
Configure the matrix mixer input from the codec output. The input
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.
Verify Room Gain
After adjusting the loudspeaker level, verify the room gain in your system using the
R
OOM G AIN meter on the D IAGNOSTICS page of Conference Composer. The Room
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.
Configure
Program Audio
Sources
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.
Figure 8. Room Gain Meter on the Diagnostics page of the Conference Composer
control software.
Room Gain Meter
Read Room Gain
from here