Bedienungsanleitung Aspi EF1210 (Seite 102 von 112) (Englisch)

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EF1210 U

SER

ANUAL

If you selected only one of the Zone Outputs, repeat for the second Zone Output.

Check Acoustic Gain.

iii. At this point you are ready to calibrate the absolute maximum room audio ampli-

fication level. For this step, you should ensure that the microphones have been

returned to their normal operating location and orientation. This procedure uses

a known nominal electrical noise signal level at the zone output to let you see if

any of the microphone input channels will exceed the permissible acoustic gain

during normal conferencing operation. The level of this noise signal is such that

if any microphone input channel registers more than three green LEDs on the

EF1210 I

NPUT

IGNAL

EVEL

ETER

, the acoustic gain limit of that microphone

channel has been reached. This represents the maximum amplification that may

be applied to the room audio. The room audio may be run at any level below this

threshold, but should not be amplified beyond this level unless the acoustic gain

is reduced by some other means (see the Troubleshooting section in the EF1210

User Manual).

All microphones should be checked in this step as verification that no micro-

phone inputs or zone outputs have been miscalibrated.

As above, both Zones can be adjusted at the same time (both AEC A and AEC B

LEDs will be lit indicating Zone A and Zone B). This is recommended because

you can check all Input Channels at the same time. Alternatively, if necessary,

you may select either Zone by pressing R

ELECT

until the appropriate AEC

LED is lit and check one Zone at a time.

You should start by selecting (from the radio buttons labeled 1 through 8) and

checking the microphone input channel which is closest to the loudspeakers or

the microphone which might be expected to pick up the most acoustic energy

from the loudspeaker audio, as appropriate. Check the acoustic gain of this

microphone using Step a, then quickly step through each of the microphone

channels to verify that no other microphone has a stronger signal.

Check and make adjustments for acoustic gain by doing the following:

a. Adjust the external room audio amplifiers/loudspeakers until either:

• The loudspeaker audio level is about to become uncomfortably loud.

• Three green LEDs on the EF1210 I

NPUT

IGNAL

EVEL

ETER

are lit, but

the first yellow (0 dB) LED is not lit for the chosen input channel

b. Next, step through the microphone input channels by choosing each input

channel from the radio buttons labeled 1 through 8, while verifying for each

channel that the first yellow (0 dB) LED is not lit on the I

NPUT

IGNAL

EVEL

ETER

• If the first yellow (0 dB) LED is lit for any channel, turn down the room

audio amplifier on the corresponding zone output or turn down the gain on

that microphone channel.

c. When all input channels have been checked, you can mark the positions of

Note.

Do not turn up the room audio level at any point after Step a.

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Aspi EF1210 Seite 102

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