AKG AS 16x12 Quick Start Manual page 8

3 Installation and Interfacing
Fig. 2: Connecting an
AS 16x12 to a DFM 4x4
and several AS 8s.
Fig. 3: AS 16x12 rear panel
3.3 Audio Inputs
Fig. 4: Connecting un-
balanced (left) and balanced
(right) signal sources.
3.4 Audio Outputs
3.5 Connecting to the
Computer
3.6 Wiring
Programmable Input
Pins
8
MASTER
SLAVE
AS 16x12
I
+ +
N
-
P
-
U
T
S
power (e.g., AKG CK 47 with GN 30 E gooseneck), set the rear panel PHANTOM POWER switch for the appropri-
ate channel(s) to ON to switch phantom power for each condenser microphone on.
If your condenser microphones require a different supply voltage, use a suitable power supply.
1. Connect the audio outputs on the AS 16x12 to the desired devices. While LINE OUTPUTS 1 through 8 are line level
only, you can set LINE OUTPUTS 9 through 12 to microphone level with the MIC/LINE switch, to match the output
level to, say, a recording device with mic level inputs.
All outputs are balanced, but you may also connect unbalanced devices. Connect the hot wire of the cable to the
"+" terminal and the shield to ground. Be sure to leave the "-" terminal floating!
Use the supplied RS-232 cable to connect the LecNet (RS-232) port on the AS 16x12 rear panel to the RS-232 port on
your computer.
The 17 Programmable Input pins can control a variety of AS 16x12 parameters. Each input can respond to either a con-
tact closure or a continuous voltage. Figs. 5 to 7 show some common connections to the Programmable Input pins.
Each Programmable Input is internally pulled up though a 100K resistor to +5 VDC, so no external pull-ups are necessary.
When using a continuous voltage with one of the Programmable Inputs, set the function of the Programmable Input to
either "Analog Input Control" or "Analog Output Control" in the "Function" line on the "Prog. Inputs" tab in the control
panel of the LecNet software.
1. Use the supplied LecNet expansion cable to connect the
EXPANSION IN port on the "Master" AS 16x12 to the
EXPANSION OUT port on the first "Slave" and so on as
shown in fig. 2.
Note: On the DFM 4x4, it makes no difference whether you
connect the cable to EXPANSION IN or EXPANSION
OUT, because the DFM 4x4 sends and receives RS-232
signals only.
2. Since all units are set to the same address at the factory,
be sure to assign a specific, unequivocal address (a
number between 128 and 256) to each unit before first
operating the sound system. Connect the units to the
computer one at a time and set each address referring to
section 4.1 "Installing the Software".
1. Connect your microphones and other audio sources to the
MIC/LINE INPUTS 1 to 16 audio input terminals. All inputs are bal-
anced. To connect unbalanced audio sources, connect the signal
lead to the "+" terminal and the shield to both the "-" and ground
terminals.
2. Use the GAIN switches to set the input gain for each input: 0 dB
for line level, +30 dB for condenser microphones, or +50 dB for
dynamic microphones.
3. If you use condenser microphones, check what supply voltage or
what type of power supply they require.
If your condenser microphones will operate on +15 V phantom