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EF1210 U
SER
M
ANUAL
38 http://www.aspi.com Copyright © 1999, All Rights Reserved
O
PERATING
THE
EF1210
U
SING
THE
EF1210 W
ITHOUT
RS-232 C
ONTROL
Changing Level
Display on
I
NPUT
and
R
EMOTE
LED Meters
When the EF1210 is in normal operating mode, pushing the I
NPUT
S
ELECT
button will
allow you to see levels of each input channel on the I
NPUT
LED meter. The green
LED corresponding to an input channel will light if the levels of that channel are cur-
rently displayed on the I
NPUT
LED meter. In the same way, pushing the R
EF
S
ELECT
button will allow you to see the levels of each reference input on the R
EMOTE
LED
meter. A yellow LED will indicate which reference (AEC A or AEC B) is displayed
on the meter.
Adjusting Volume in
Zones
The reference LEDs (AEC A or AEC B) do double duty. They not only indicate
which Reference Input is currently displayed on the R
EMOTE
LED meter, but also
indicate which Zone Output is affected when the L
EVEL
A
DJUST
buttons are pressed.
The AEC A LED indicates that Z
ONE
A’s volume is being adjusted by the L
EVEL
A
DJUST
button. The AEC B LED indicates that Z
ONE
B’s volume is being adjusted
by the L
EVEL
A
DJUST
button. The output levels can be adjusted up to 6 dB above and
12 dB below the nominal zone output level. The nominal zone output level is 6 dB
below the level selected in Calibration Step 2: Calibrating Zone Outputs.
Adjusting Playback
Levels
The A
UX
I
N
input and R
EC
output signals are preset to -10 dBV signal levels. The
level of the A
UX
I
N
signal may be adjusted during normal operation to compensate for
low or high audio level from an external playback device.
1. During normal operation, press and hold the A
UX
I
N
L
EVEL
/S
ETUP
button while
using the L
EVEL
A
DJUST
buttons to adjust the level of the playback signal. The
level-adjusted A
UX
I
N
signal is mixed with the A
MIX
I
N
signal (nominally 0dBu)
and sent to the T
O
CODEC connector. It is also mixed with the AEC A signal
and played over the Zone A output.
Muting
To mute channels while using the EF1210 without RS-232 control, for push-to-talk
microphones for example, we suggest using the mute control capability on the mixer
rather than using a microphone with mute built inside it. The AEC will perform bet-
ter using this method because it allows the speech to be processed inside the EF1210
before being muted instead of totally cutting off the speech so that the AEC has to
readapt when the microphone comes on again.
Splitting zones
Calibrate using calibration procedures. When using more than one zone, refer to
“Calibration Step 5: Zone/Reference Setup” on page 34 to associate each microphone
input channel with a reference. If you are using two reference signals (Reference A
and Reference B), Input Channel 1 must be associated with Reference A (AEC A)
and Input Channel 8 must be associated with Reference B (AEC B). The other 6
microphones can be associated with either reference
40


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