Lectrosonics DMPA12 - Manual (Page 6)

DMPA12 Installation Guide
LECTROSONICS, INC. 6
Rack Installation
The DMPA12 occupies a single rack space and there
are no special ventilation requirements. Mount with 4
rack screws through the ears on the front panel.It is
recommended to use nylon washers to prevent damage
to the front panel’s finish when tightening the screws.
While it is not mandatory, it is good practice to leave an
empty rack space above the amplifier.
The amplifier should be mounted in a rack with rear
support rails. Adjustable brackets are provided.
Cables and Power Cord
It is recommended to use lacing bars for cable strain
relief when mounting in a rack. Use only professional
grade audio, either a twisted pair type or two conduc-
tors plus ground/shield.
The power input jack is a standard 3-pin type that ac-
cepts commonly available cords with IEC 60320 C13
connectors – the same type 3-pin socket typically used
on computers and peripherals with built in power sup-
plies. The internal switching power supply will handle
voltages ranging from 100 VAC to 240 VAC for use with
power sources outside of North America.
Audio Inputs
Input signals are delivered from DM Series processors
into the power amp via the DANI (digital audio network
interface) bus using the supplied CAT-5 cables con-
nected to the Expansion ports.
Speaker Outputs
All outputs are a balanced differential configuration and
can be used with shielded or unshielded cabling. Two
adjacent outputs can be combined to double the power
delivered to a loudspeaker by wiring them in parallel.
NOTE: The design of the Class D amplifier
requires that adjacent channels be wired in
parallel in order to combine them. This is different
than the wiring used to bridge the outputs on a
conventional analog power amplifier.
WARNING: DC voltage is present on the
outputs, which are designed to operate ONLY
in a balanced configuration. If either the (+) or
(-) pins are grounded, the outputs that share
that connector will automatically shut down
and a fault will be indicated on the front panel
(blinking orange LEDs).
Hardware Installation
Rear support brackets are included with the amplifier
+
-
+
-
Loudspeaker wiring with unshielded twisted pair
+
-
+
-
Loudspeaker wiring with shielded cables
+
-
+
-
Two adjacent outputs can
be combined to double the
available power for one
loudspeaker by wiring two
adjacent outputs in parallel.
NOTE: When the outputs are wired
this way, the same signal source and
DSP processing must be selected for
both outputs. See the Source Tab in the
software GUI for this selection.
There are no
analog audio
inputs to the
amplifier