Hardware Installation; Installing The Dm84 System Into A Rack; Cables; Audio Connections - Lectrosonics DM84 Hardware And Software Installation Manual

DM84 Installation Guide

Hardware Installation

Installing the DM84 System Into a Rack

The DM84 occupies a single rack space and there are
no special ventilation requirements. Mount with 4 rack
screws using the appropriate mounting holes. It is
recommended to use nylon washers to prevent damage
to the front panel's finish when tightening the screws.
For North American installations, connect the Power
Cable supplied with the unit between the DM84 and a
stable power source. The DM84 has an internal
switching power supply that can tolerate voltages
ranging from 90 VAC to 240 VAC. Use an approved
power cable for installations outside North America.

Cables

It is recommended to use lacing bars for cable strain
relief when mounting in a rack. Use only professional
audio cable with proper shielding - typically, two con-
ductor plus ground/shield.

Audio Connections

The analog audio inputs and outputs are connected
through 5 pin de-pluggable connectors. Strip the
insulation back 1/8 to 3/16" but do not tin (apply solder
to) the leads. Insert the wire into a de-pluggable
connector, leaving less than 1 mm of bare wire ex-
posed, then tighten the retaining screw.
Caution: Do not over tighten the retaining
screw.
Retaining Screw
(Do not overtighten)
Do not tin (apply solder
to) leads
Note the labeling on the DM84 Chassis for the positive
and negative leads. Ground is shared between two
connections (the center pin). For balanced connec-
tions, all three leads can be connected.
NOTE: The DM84 does not have a "pin 1 problem."
6
5-pin depluggable
connector
Do not leave more than
1 mm of exposed wire
beyond the connector.

Audio Connection Guidelines

Unbalanced and balanced input connections use the
following guidelines.

Audio Inputs

Unbalanced Sources

Unbalanced audio sources (positive and ground)
include items such as consumer VCR's, DVD players,
etc., and may use both two wire and three wire cables.
In either case, the positive output from the source
should be connected to the appropriate positive (+)
input on the DM84. The shield or negative (–) output
should be connected the DM84's negative (–) input.
Two wire cables should have a jumper between the
DM84 negative input and ground. Three wire cables
should have the shield connected to the DM84's ground
input and the shield and negative (–) leads joined
together at the unbalanced source end.
Source
+
Unbalanced source to DM input
Source
+
Unbalanced source to DM input
(3-Wire)
WARNING: Do not activate phantom power for
unbalanced sources. Refer to online help files
after the software is installed.

Balanced Sources

Balanced differential sources from external equipment
and microphones should be wired according to Bal-
anced source to DM84 input (3-Wire). (See illustra-
tion.) When connecting balanced sources to the DM84,
it is important to not connect chassis ground (shield) to
either signal conductor.
DM In
+
-
Shield
(2-Wire)
DM In
+
-
Shield
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