Manual Aspi EF1210 (page 34 of 112) (English)

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EF1210 U

SER

ANUAL

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.

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

2.6. Next, step through the microphone input channels by pressing the I

NPUT

ELECT

button, 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.

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

volume controls on the room audio amplifiers and note that this is the absolute

maximum amplification that may be applied to room audio. This maximum

amplification will be referred to in this manual as the amplifier acoustic gain

limit.

During normal operation, the zone output levels will be set 6 dB lower than the

selected level (amplifier acoustic gain limit) to allow the EF1210 L

EVEL

DJUST

con-

trols to apply a volume adjustment to the room audio signal in the range +6 dB to -12

dB.

Refer to Figure 12 on page 31 for further explanation.

ALIBRATION

TEP

3: C

ALIBRATING

AEC R

EFERENCE

NPUTS

3.1. Once the Zone Output channels and room audio amplifier have been calibrated,

press the A

EVEL

ETUP

button again to switch to AEC Reference Input

Note.

You should start by selecting (using the I

NPUT

ELECT

button) 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 appro-

priate. Check the acoustic gain of this microphone using Step 5,

then quickly step through each of the microphone channels (step 6)

to verify that no other microphone has a stronger signal.

Note

Do not turn up the room audio level at any point after Step 5.

Note

The volume control may be set at a lower level than this marked

position (amplifier acoustic gain limit), but must not be set higher

or the performance of the echo canceller will be suboptimal.

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Aspi EF1210 Manual

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