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Table Of Contents

Model 41 Interface

Issue 3, November 2013 Model 41 User Guide

Page 10 Studio Technologies, Inc.

balanced or unbalanced sources. A bal-

anced source should be wired so that sig-

nal high is connected to the + pin, signal

low to the – pin, and shield to the shield

pin. With an unbalanced source, connect

signal high to the + pin, and shield to both

the – and the shield pins. If connecting an

unbalanced source in this manner results

in hum or noise, try connecting signal high

to the + pin, and shield to the – pin; leave

the shield pin unterminated.

As previously mentioned, the Model 41 is

compatible with matrix intercom systems

from Riedel. Appendix A, located near the

end of this user guide, provides detailed

connection information.

IFB Outputs

The Model 41’s four independent IFB out-

puts each supply DC power and two chan-

nels of unbalanced audio. The IFB outputs

are designed to connect to a variety of

devices that conform to the broadcast

IFB standard. In this implementation pin

1 is used for a combination of shield, DC

power return, and audio common;

pin 2 supplies a combination of DC power

and one channel of unbalanced audio;

pin 3 supplies a second channel of unbal-

anced audio. The DC power supplied on

pin 2 is 30 volts with a maximum current

of 220 milliamperes. The audio superim-

posed on the DC power has a nominal

signal level of –10 dBu. Its audio source

is the channel 1 audio input associated

with that speciﬁc IFB output. The audio

on pin 3 also has a nominal signal level of

–10 dBu. Its audio source is the channel

2 audio input associated with that speciﬁc

IFB output.

Signal Signal

Connections High (+) Low (–) Shield

IFB Output 1-Channel 1 24 12 25

IFB Output 1-Channel 2 10 23 11

IFB Output 2-Channel 1 21 9 22

IFB Output 2-Channel 2 7 20 8

IFB Output 3-Channel 1 18 6 19

IFB Output 3-Channel 2 4 17 5

IFB Output 4-Channel 1 15 3 16

IFB Output 4-Channel 2 1 14 2

Notes:

1) Connector type on Model 41 is 25-pin D-subminiature

female. Installer must provide plug (male). Connector uses

4-40 threaded inserts for locking with mating plug.

2) Wiring scheme follows TASCAM DA-88 convention.

Standard DA-88-style wiring harnesses are directly

compatible, with the exception of 4-40 screw threads being

required.

Figure 4. Connections for audio inputs using

dual-channel nomenclature

Signal Signal

Connections High (+) Low (–) Shield

IFB Output 1-Interrupt 24 12 25

IFB Output 1-Program 10 23 11

IFB Output 2-Interrupt 21 9 22

IFB Output 2-Program 7 20 8

IFB Output 3-Interrupt 18 6 19

IFB Output 3-Program 4 17 5

IFB Output 4-Interrupt 15 3 16

IFB Output 4-Program 1 14 2