Reference Manual
Rio Rancho, NM
The LecNet 2 product family includes a variety of com-
ponents to address a wide variety of applications. Differ-
ent processor models interface with the digital matrix in
different manners.
Four basic matrix processor models are available:
• DM812
8 in/12 out
• DM1612
16 in/12 out
• DM1624
16 in/24 out
• DM84
8 in/4 out
Each of these models provides mic/line inputs, exten-
sive signal processing and differential balanced outputs.
Outputs are forward propagated to the Master unit in a
stack, and the first 12 outputs are also back propagated
to the Slaves in the system.
The DMTH4 telephone hybrid and DM84 processor
contribute to all 24 forward propagated channels deliv-
ered to the Master in the system, even though each of
them have only 3 or 4 physical outputs. The signals for
these 3 or 4 outputs are selected from the first 12 final
mixes back propagated from the Master.
Signal flow through the DANI bus
Master
Slave
Slave
Slave
Slave
EXPANSION
A
B
TX
RX
RX
TX
EXPANSION
A
B
TX
RX
RX
TX
EXPANSION
A
B
TX
RX
RX
TX
EXPANSION
A
B
TX
RX
RX
TX
EXPANSION
A
B
TX
RX
RX
TX
Audio Final Mix and
Data Back Propagation
Audio Submix and
Data Forward Propagation
The DMPA12 digital power amplifier takes its inputs
from the DANI bus. It can access either the first 12 back
propagated signals from the system Master unit or the
24 forward propagated channels.
The output amplifiers are a Class D type in a differential
balanced configuration with each device providing two
channels, sharing a ground on a common connector.
The device is impervious to damage from shorts or
thermal overload, and can drive loudspeaker loads from
4 ohms and up. The outputs can also be wired in paral-
lel to double the available output power.
Because of the high efficiency of the Class D design,
no special ventilation or fans are necessary, even in
continuous duty at any power level.
