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Aspi EF1210 Manual

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A
DVANCED
I
NSTALLATION
ASPI Digital - The Sound of DSP Technical Support: 404.892.3200 31
2.2. Press the R
EF
S
ELECT
button to choose which output is being calibrated. A nom-
inal level noise signal is played through the selected Zone output(s).
• When the EF1210 first enters Zone Output calibration, the AEC A and AEC
B LEDs are lit, indicating that both zones will be calibrated. Use this if you
want to calibrate both zones at the same time.
• If you want to calibrate only Zone A, press the R
EF
S
ELECT
button to select
Zone A. Only the AEC A LED lights, indicating Zone A.
• If you want to calibrate only Zone B, press the R
EF
S
ELECT
button again to
select Zone B. Only the AEC B LED lights, indicating Zone B.
2.3. Check the specifications of your room audio amplifier input:
• If it expects consumer level (-10 dBV) input, press the L
EVEL
A
DJUST
D
OWN
button once.
• If it has a balanced input connector and expects 0 dBu input level, press the
L
EVEL
A
DJUST
U
P
button once.
More precise level adjustments can be made with the RS-232 commands (see the
GAINZ command on page 68 of the Command Set Reference.
2.4. If you selected only one of the Zone Outputs, repeat for the second Zone Output.
For visual instructions, refer to Figure 12 on page 31.
Check Acoustic Gain.
2.5. 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
S
IGNAL
L
EVEL
M
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 “Acoustic Gain” on page 44).
All microphones should be checked in this step as verification that no micro-
phone inputs or zone outputs have been miscalibrated.
Figure 12. Calibrating Zone outputs
AUX IN
LEVEL
REF
SELECT
INPUT
SELECT
SETUP
AEC
A
AEC
B
12345678
INPUTPOWER REMOTE
MUTE
ALL
LEVEL
ADJUST
SETUP
STEP 2.6: adjust external
amplifiers/loudspeakers so that
no more than 3 green LEDs are
lit (repeat for each channel)
-12 -7 -3 0 3 20 dB -12 -7 -3 0 3 20
STEP 2.2:
press to select
noise source
noise to both zones (recommended)
noise to zone A
noise to zone B
STEP 2.6: press
to select
channel;
check level
LEDs light to
indicate which
channel is selected
LED blinks
twice for Zone
calibration
STEP 2.3a: press
if amp expects
consumer level
input (-10 dBV)
STEP 2.3b:
press
if amp
expects 0 dBu
balanced input
… 33 …


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