L-Acoustics MTD 112, Owner'S Manual

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MTD 112 31 06/97
d) sense return connection
The "sense return" is a path for a signal output of the power amplifier (2 channels) to both
the loudspeaker(s) and a control signal for the limiting functions of the LLC controller. It is to
be of the same type as a loudspeaker cable, with a 4 pins Speakon plug at one end and a
connector assembly at the other end which is to be compatible with the outputs of the
power amplifier.
The wiring of the "sense return" speakon connector is :
ch.1 : 1+ & 1-
ch.2 : 2+ & 2-
6.3 CONTROLLER WIRING & KEY SELECTIONS
a) Rear connections (left to right)
*
Connect the mains supply with the mains cord provided in the package. The
Euroconnector shall be connected to the corresponding socket at the rear of the unit. The
mains plug shall be selected according to local standards.
*
A fuse is provided. Its value is 0.2 Amperes, of the slow type.
* Connect the outputs of two amplifier channels to the "sense return"' socket.
Warning! when new, old type Speakon connectors are a bit hard to turn by 1/4 turn, which
is necessary to establish the contact.
*
If you use a central source or a subwoofer, connect a modulation shielded cable
(one pair) to the "sum/sub" output. This output provides the signal to feed a power amplifier.
It is line-level and balanced.
*
Connect the two principal outputs of the unit, i.e. Channels 1 & 2 to two independent
channels of a power amplifier.
b) Front connections(left to right)
*
Connect the signal input (XLR, balanced) to the female or male socket.
* If necessary, connect the male input of the unit to the female one of another unit.
These two connectors (M & F) are in parallel.
*
The first key is to select the configuration of the MTD 112.
MONITOR provides a frequency response which is best matched to floor-monitor
applications.
FRONT provides a broad-band frequency response which is best matched to usual
sound reinforcement applications.
X.OVER provides a frequency response which is high-pass filtered at 110Hz, to be
used when subwoofers are in operation.
*
The second key is to select the configuration of the mono output.
SUB provides a band-pass filtered summed signal of the inputs of controller. The
crossover frequency is 110 Hz.The high-pass section of the SUB filtering is set for both the
SB 115 and the MTD 118 as standard (40 Hz, boost at 50 Hz). On option, it is available set
for the SB 218 (25 Hz, boost at 33 Hz).
SUM provides a straightforward broad-band summed signal of the inputs . When it is
desired to use a summed, unfiltered mono signal and separately a subwoofer mono signal,
just switch the selection keys accordingly.