Biamp AUTOTWO - Manual (Page 5)

3
REAR PANEL
DC Power Cord: The included power supply module provides 24
Volt DC power to the mixer. It is connected to the DC Power Jack
on the rear side of the mixer. To ensure compatibility, only use a
Biamp Systems supplied power supply.
Logic Outputs: This 9-pin Sub-D (male) connector provides logic
outputs from the eight channels, plus a common ground. When a
channel becomes active, the associated logic output turns on.
Logic Outputs are used to control external circuits for switching
speakers, cameras, or indicators (see Logic Outputs on pg. 4).
Expansion: This 6-pin Modular jack is for connection of a second
autoTWO mixer to add system inputs. When using two autoTWO
mixers in a system, it is necessary for the mixers to share
information regarding active channels. This information allows the
mixers to properly perform NOM Attenuation & Adaptive Threshold
Sensing. This connection requires a single Modular cable
(provided). The information shared is processed primarily by the
‘master’ autoTWO. To prevent system errors, the second
autoTWO mixer should be assigned as ‘slave’ (see Master DIP
Switches below). Channel 1 override can be achieved by shorting
pins 3 & 6 (see Logic Outputs on pg. 4).
Main Output: These plug-in barrier strip terminals provide the
balanced line-level Main Output from the mixer. For balanced
connection, wire high (+), low (-), and ground (
d ). For unbalanced
connection, wire high (+) and ground ( d ), leaving (-) unconnected.
Signal level will be reduced by 6dB when output is unbalanced.
Main Output level is affected by the front panel Master control, as
well as by automatic NOM Attenuation, which reduces the output
level by 3dB for each doubling of active (gated) channels.
Aux Output: These plug-in barrier strip terminals provide the
balanced line-level Aux Output from the mixer. For balanced
connection, wire high (+), low (-), and ground (
d ). For unbalanced
connection, wire high (+) and ground ( d ), leaving (-) unconnected.
Signal level will be reduced by 6dB when output is unbalanced.
Aux Output level is affected by the front panel Aux control, but not
by automatic NOM Attenuation.
Stack In: These plug-in barrier strip terminals provide a balanced
line-level Stack In to the mixer. Signal entering here is combined
with signals from the input channels, and is then sent to the Main
Output section. When using multiple autoTWO mixers within a
system, connect Main Output of one mixer to Stack In of the next
mixer, and so forth. All mixers except the final autoTWO should be
assigned as ‘slaves’ (see Master DIP Switches below). For
balanced connection, wire high (+), low (-), and ground (
d ). For
unbalanced connection, wire high (+) and ground to both ( d ) & (-).
Inputs & Direct Outputs (Channels 1~8): These plug-in barrier
strip terminals provide the balanced mic/line Inputs to the mixer.
For balanced connection, wire high (+), low (-), and ground (
d ).
For unbalanced connection, wire high (+) and ground to both ( d ) &
(-). Phantom power (+48VDC) is available (see DIP Switches
below). Unbalanced 'pre-fader' Direct Outputs are available on
Channels 1~8, using the (d. out) & (
d ) terminals.
Master DIP Switches: These switches assign functions to the
mixer as a whole (when pushed up). Slave assigns the mixer as
an expander to a ‘master’ mixer. -12dB selects -12dB channel-off
attenuation (instead of -40dB). HP Filter assigns a high-pass filter
of 6dB/octave @ 170Hz. Last Mic causes the most recently active
channel to remain on. Aux Post assigns post-gate/level channel
signals to the Aux Output (instead of pre-gate/level signals).
DIP Switches (Channels 1~8): These switches assign functions
to the individual channels (when pushed up). Pad attenuates input
signal -18dB (line input). Ungated turns channel on (defeats gate).
Phantom turns on +48V phantom power (for condenser mics).
Duck Ch 8 (Channels 1~7 only) assigns channel signal to activate
-12dB attenuation on Channel 8 (ducking). Aux Off (Channel 8
only) removes Channel 8 signal from Aux Output (mix-minus).
D. Out Pre assigns pre-gate signal to channel direct output (d.
out), instead of post-gate signal.