Bedienungsanleitung Polycom Vortex EF2280 (Seite 15 von 62) (Englisch)

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INSTALLATION

Presets and Multiple

EF2280s

PRESET 0 is preconfigured for a system with multiple EF2280s. Microphones are

bussed out to other units on the W Bus. Microphones are also input into each EF2280

on the W Bus (I

NPUT WM0 in the Matrix).

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 ON PRESET to the correct Preset.

HECK

URROUNDING

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:

Pick a Standard

Signal Level

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.

Check Levels to the

Codec

Configure the matrix mixer output to the codec input. The output

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. 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.

Configure Output to

Amplifier or

Loudspeakers

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

NPUTS tab on

Conference Composer) to obtain a 0 dB level at the input.

Verify Room Gain After adjusting the loudspeaker level, verify the room gain in your system using the

OOM GAIN meter on the DIAGNOSTICS page of Conference Composer. See Figure 9

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.

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Polycom Vortex EF2280 Seite 15

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