Check Surrounding Equipment - Polycom Vortex EF2280 Reference Manual

Presets and Multiple
EF2280s
C S
HECK URROUNDING
Pick a Standard
Signal Level
Check Levels to the
Codec
Configure Output to
Amplifier or
Loudspeakers
Verify Room Gain
© Polycom, Inc.
P 0 is preconfigured for a system with multiple EF2280s. Microphones are
RESET
bussed out to other units on the W Bus. Microphones are also input into each EF2280
on the W Bus (I WM0 in the Matrix).
NPUT
If you have multiple EF2280s in your system, save settings to a preset on each
EF2280. Saving a preset will only save the preset on that particular unit. Also,
remember to set the P
OWER
E
QUIPMENT
Now that the physical connections to the EF2280 are set up, it may be necessary to
check the surrounding equipment to make sure levels are set correctly. The following
suggestions may be helpful in integrating the EF2280 into your system:
A standard nominal signal level should be used throughout the audio system. Any
equipment that does not operate at this standard level should be compensated for as
close to the piece of equipment as possible. A 0 dB nominal level is a good standard
signal level. For example, a consumer VCR will probably generate a -8 dBu level.
As soon as the VCR signal arrives at an input with some gain control, the input gain
should be adjusted so that you get a 0 dB level.
Configure the matrix mixer output to the codec input.
gain of the matrix mixer should be set to match the nominal input level of the codec.
For example, if the codec accepts -10 dBV (-8 dBu) inputs, 8 dB of attenuation should
be applied at the matrix mixer output to the codec.
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.
The loudspeaker level may be adjusted in several places: at the amplifier or at the
loudspeaker output of the matrix mixer in the EF2280. We suggest that you adjust the
loudspeaker level at the amplifier to preserve good gain structure. You should try to
have a 0 dBu nominal level at the outputs by applying input gain (See I
Conference Composer) to obtain a 0 dB level at the input.
After adjusting the loudspeaker level, verify the room gain in your system using the
R G meter on the D
OOM AIN
below. The meter shows the room gain, which is the relative level of the output level
and the input level. While the EF2280 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.
13
O P to the correct Preset.
N RESET
page of Conference Composer. See Figure 9
IAGNOSTICS
V
ORTEX
I
NSTALLATION
The output
The input
tab on
NPUTS
EF2280 Reference Manual