Lectrosonics DMTH4 User Manual download pdf (Page 7)

Installation Guide

Rio Rancho, NM

DM In

Source

Unbalanced source to DM input

(3-Wire)

Shield

DM In

Source

Unbalanced source to DM input

(2-Wire)

Shield

Balanced source to DM input

(3-Wire)

DM In

Source

Shield

Installing the DM system into a rack

The DMTH4 occupies a single space. 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 DMTH4 and

a stable power source. All DM processors have inter-

nal switching power supplies that can tolerate voltages

ranging from 100 VAC to 240 VAC. Use an approved

power cable for installations outside North America.

Cables

It is recommented 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 insu-

lation 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 DMTH4 Chassis for the posi-

tive and negative leads. Ground is shared between two

connections (the center pin).

Note: The DM Series does not have a “pin 1

problem.” Inputs and outputs are true differential

connections.

Audio Inputs (AUX and CODEC)

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 DMTH4. The shield or negative (–) output

should be connected the DM’s negative (–) input. Two

wire cables should have a jumper between the DMTH4

negative input and ground. Three wire cables should

have the shield connected to the DMTH4’s ground input

and the shield and negative (–) leads joined together at

the unbalanced source end.

Balanced Sources

Balanced differential sources from external equipment

and microphones should be wired according to Bal-

anced source to DM input (3-Wire). (See illustration.)

When connecting balanced sources to the DMTH4, it

is important to not connect chassis ground (shield) to

either signal conductor.

Hardware Installation

5-pin depluggable

connector

Do not leave more than

1 mm of exposed wire

beyond the connector.

Do not apply

solder to leads

Retaining Screw

(Do not overtighten)

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Lectrosonics DMTH4 User Manual Page 7

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