Lectrosonics DMPA12 User Manual download pdf (Page 6)

DMPA12 Installation Guide

LECTROSONICS, INC.

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

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Lectrosonics DMPA12 User Manual Page 6

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