Polycom EF2241 manual Configure the matrix mixer input from the codec output. The input

INSTALLATION

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 ROOM GAIN meter on the DIAGNOSTICS 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.

Room Gain Meter

Read Room Gain from here

Configure

Program Audio

Sources

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.

VORTEX EF2241 Reference Manual 14 Technical Support: 800.932.2774