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BIAMP SYSTEMS
Portland, Oregon
an affiliate of
Rauland-Borg Corp.
~
27V
50/60 Hz
10 watts
class 2 wiring
MADE IN U.S.A.
Output: These plug-in barrier strip terminals are for connection to
the input of a sound system equalizer/amplifier. The Output
provides a balanced stereo line-level program signal, with
automatic level adjustment to compensate for changes in ambient
noise. The ANC22 works equally well with a mono program signal
connected to either the left or right Input/Output. For connection to
unbalanced equalizer/amplifier inputs, wire high to (+) and ground
to (
), leaving (-) unconnected. The Output has an additional 6dB
ý
of gain when used in a balanced fashion.
Input: These plug-in barrier strip terminals are for connection to
the output of a program signal source. The Input accepts a
balanced stereo line-level program signal. The ANC22 works
equally well with a mono program signal connected to either the
left or right Input/Output. For connection to unbalanced program
signal sources, wire high to (+) and ground to both (-) & (
Input will accept either +4dBu or -10dBu nominal level signals (see
Input Level Switch below).
Input Level Switch: This push-button switch determines the
proper gain at the Input, allowing the ANC22 to accomodate
various program source signals. When depressed, the Input Level
Switch selects -10dBu as the appropriate Input signal level (+10dB
gain). This is good for program sources (such as CD, tape, etc.)
which are typically unbalanced line-level signals. When released,
the Input Level Switch selects +4dBu as the appropriate Input
signal level (-4dB gain). This is good for program sources (such
as mixers, equalizers, etc.) which are typically balanced line-level
signals.
REAR PANEL / CONNECTIONS
output
R
L
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received,
including interference that may cause undesired operation.
). The
ý
input
R
L
input
level
+ 4
-10
Sense Input:
These plug-in barrier strip terminals are for
connection of an external microphone, which is used to pick up
room ambient (background) noise. An internal microprocessor
then samples the noise, calculates an 'average' noise level, and
adjusts the program signal level accordingly. The microphone
should be of the balanced, low-impedance type.
microphones are recommended (see Phantom Power Switch
below), although dynamic microphones are acceptable. For
applications where ambient noise is evenly distributed throughout
the room, sensing microphones with 'omnidirectional' or
'hemispherical' pick-up patterns are prefered. For applications
where ambient noise is more localized, 'unidirectional' pick-up
patterns may be more appropriate. If multiple microphones are
desired (to cover a larger area) an external microphone mixer may
be used (see Pad Switch below). Microphones should be placed
within a room so as to pick up both ambient noise and a moderate
amount of program signal from the sound system.
-30dB Pad Switch: When depressed, this push-button switch
provides 30dB of attenuation, to compensate for different signal
levels at the Sense Input. Depress the Pad Switch when Sense
Input signal levels exceed the normal operating range of the front
panel Sense Level control, or when line-level input from a
microphone mixer is desired.
Phantom Power Switch: When depressed, this push-button
switch provides +24 Volts DC phantom power to the Sense Input,
for powering a condenser type microphone. CAUTION: The
Phantom Power Switch must be released (phantom power off)
when the Sense Input is to be connected to a line-level source,
such as a microphone mixer. Always turn levels down before
switching phantom power.
2
sense input
-30dB
phantom
pad
power
out
off
in
on
Condenser
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