Lectrosonics DM84 User Manual download pdf (Page 6)

DM84 Installation Guide

LECTROSONICS, INC.

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.

WARNING: Do not activate phantom power for

unbalanced sources. Refer to online help ﬁles

after the software is installed.

DM In

Source

Unbalanced source to DM input

(2-Wire)

Shield

DM In

Source

Unbalanced source to DM input

(3-Wire)

Shield

Balanced Sources

Balanced differential sources from external equipment

and microphones should be wired according to the fol-

lowing illustration. When connecting balanced sources

to the DM84, it is important to not connect chassis

ground (shield) to either signal conductor.

Balanced source to DM input

(3-Wire)

DM In

Source

Shield

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 rec-

ommended 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 switch-

ing 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 insula-

tionback1/8to3/16”butdonottin(applysolderto)

the leads. Insert the wire into a de-pluggable connec-

tor, leaving less than 1 mm of bare wire exposed, then

tighten the retaining screw.

Caution: Do not over tighten the retaining

screw.

Note the labeling on the DM84 Chassis for the positive

andnegativeleads.Groundissharedbetweentwocon-

nections (the center pin). For balanced connections, all

three leads can be connected.

5-pin depluggable

connector

Do not leave more than

1 mm of exposed wire

beyond the connector.

Do not tin (apply solder to) leads

Retaining Screw

(Do not overtighten)

NOTE:TheDM84doesnothavea“pin1problem.”

Hardware Installation

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Lectrosonics DM84 User Manual Page 6

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