Studio Technologies 40 Bedienungsanleitung

5520 West Touhy Avenue

Skokie, Illinois 60077 U.S.A.

Telephone (847) 676-9177

Fax (847) 982-0747

www.studio-tech.com

Model 40 Central Controller

and Related Components

User Guide

Issue 1, July 1994

50065-794, Issue 1

Model 40 User Guide Issue 1, July 1994

Studio Technologies, Inc. Page 3

Table of Contents

Introduction ................................................................. 5

What This User Guide Covers ................................ 5

System Overview .................................................... 5

Model 40 Central Controller .................................... 5

Model 35 Talent Amplifier ....................................... 7

Model 38 Talent Amplifier ....................................... 7

Installation................................................................... 9

Configuration............................................................... 13

Operation .................................................................... 13

Model 40 Central Controller .................................... 13

Talent Amplifiers ..................................................... 14

Troubleshooting .......................................................... 15

Technical Notes .......................................................... 15

Circuit Description ....................................................... 17

Specifications .............................................................. 23

Appendix ..................................................................... 25

Block Diagrams

Model 40 Central Controller

Model 35/Model 38 Talent Amplifiers

Issue 1, July 1994 Model 40 User Guide

Page 4 Studio Technologies, Inc.

This page intentionally left blank.

Model 40 User Guide Issue 1, July 1994

Studio Technologies, Inc. Page 5

Introduction

The Model 40 Central Controller, along

with related components, are part of the

StudioComm series. StudioComm prod-

ucts provide monitoring and communica-

tions functions for professional audio

applications. The Model 40 Central

Controller, along with up to eight Model 35

or Model 38 Talent Amplifiers, allow the

creation of sophisticated headphone (cue)

systems for use in recording, broadcast,

film, and specialized applications. With a

totally unique, proprietary design, a spe-

cialized, high-quality headphone system

is easily configured and installed.

What This User Guide Covers

This User Guide is designed to assist

you when installing, configuring, and

using the Model 40 Central Controller,

Model 35 Talent Amplifier, and Model 38

Talent Amplifier. It also contains detailed

service information, including block and

schematic diagrams.

System Overview

The underlying concept of a StudioComm

headphone system is distributed amplifica-

tion. The Model 40 Central Controller

provides two stereo line inputs, each

which can be assigned to two output

groups. Each output group distributes line-

level stereo audio and DC power over

standard 3-conductor microphone-type

cables to up to four Model 35 or Model 38

Talent Amplifiers. Two pairs of head-

phones can be connected to each talent

amp. By placing the final output stage in

the talent amplifiers, superior audio quality

can be delivered directly to the user.

The highlight of a StudioComm head-

phone system is the sonic quality; low

distortion, low noise “high fi” audio with an

output level loud enough for “rock ‘n roll.”

The entire audio path is optimized for one

thing: making headphones sound great.

The design and implementation of a

StudioComm headphone system is simple.

Cables terminated with standard 3-pin

XLR-type connectors link the Model 40

Central Controller with the talent amplifi-

ers. For assistance, both input and loop-

through connectors are provided on

each talent amp. For the first time, cable

length simply stops being an issue.

Locating talent amplifiers over 500 feet

(164m) away from a Model 40 is perfectly

acceptable.

Model 40 Central Controller

The Model 40 is the connection point for

the audio inputs, and provides the talent

amplifier outputs which connect to the

talent amplifiers. The unit mounts in one

standard rack space.

Issue 1, July 1994 Model 40 User Guide

Page 6 Studio Technologies, Inc.

Two Stereo Line Inputs

The analog outputs of consoles, worksta-

tions, off-air receivers, or virtually any

analog source can be connected to the

Model 40’s line inputs. The inputs accept

balanced or unbalanced signals, with an

acceptable input level range of –10dBV to

+10dBu. Signal Present LEDs provide

assistance when adjusting the input level

controls.

Talent Amplifier Output Groups

Each of the two output groups is designed

to feed up to four StudioComm talent

amplifier modules. The physical output

of each group is a 3-pin male XLR-type

connector that provides power and left

and right audio to the talent amplifiers.

The talent amplifier output groups are

short circuit protected. Error conditions

are displayed by the Over Current LEDs

on the Model 40’s front panel.

Model 40 Back Panel

Model 40 Front Panel

Power

present LED

MODEL 40 CENTRAL CONTROLLER

SKOKIE, ILLINOIS U.S.A.

SIGNAL

PRESENT

POWER

INPUT 1

INPUT LEVEL

SIGNAL

PRESENT

INPUT 2

INPUT LEVEL

LR OVER

CURRENT

OUTPUT GROUP A OUTPUT GROUP B

INPUT 1

INPUT 2

OVER

CURRENT

INPUT 1

INPUT 2

5520 WEST TOUHY AVE.

SEE INSTRUCTION MANUAL

CAUTION:

TO PREVENT ELECTRICAL

SHOCK, DO NOT REMOVE

COVER OR BACK.

NO USER SERVICEABLE

PARTS INSIDE. REFER

SERVICING TO QUALIFIED

SERVICE PERSONNEL.

100V

120V

220/240V

50/60Hz

0.4A

0.2A

TO TALENT AMPLIFIERS

MODEL 40 CENTRAL CONTROLLER

MADE IN U.S.A.

(708) 676-9177

SKOKIE, IL 60077 U.S.A.

OUTPUT B

INPUT 1

TO TALENT AMPLIFIERS

OUTPUT A

INPUT 2

AC mains

connection

Mains voltage

configuration chart

Input level adjustable

over –10dBV to

+10dBu range

Switch between

Input 1 and 2 for the

Output Groups

LEDs display

error conditions

Output to talent

amplifiers—

Group B

Output to talent

amplifiers—

Group A

Stereo line inputs

1 and 2

Signal

Present LEDs

Model 40 User Guide Issue 1, July 1994

Studio Technologies, Inc. Page 7

Model 35 Talent Amplifier

The Model 35 Talent Amplifier is a por-

table amplifier unit capable of driving two

sets of high-impedance headphones

(>150Ω). The audio output is loud, and

very “clean.” The units feature a built-in

level control, a stereo/mono switch, and a

power present LED. A single microphone-

type cable links the Model 35 with the

Model 40 Central Controller.

Model 38 Talent Amplifier

The Model 38 Talent Amplifier takes the

basics from the Model 35 and adds a

unique stereo preamplifier section. This

allows a musician’s microphone or line-

level signal to be “looped” through the

Model 38, boosted by its preamp, and then

combined with the stereo cue mix supplied

by the Model 40. This allows the Model 38

user to create an individual headphone

Two headphone

outputs

HEADPHONE

OUTPUT

OUTPUTLEVELPOWER

STEREO

MONO (L+R)

Headphone output

level control

Power present

LED Switch between stereo

and mono (L+R) output

INPUTLOOP THRUMADE IN U.S.A.

5520 W. TOUHY AVE.

SKOKIE, IL. 60077

U.S.A.

MODEL 35 TALENT AMPLIFIER

PUSH

Connects to additional

talent amplifiers Connects to the Model 40 or another talent

amplifier’s loop thru connector

Model 35 Front Panel

Model 35 Back Panel

Issue 1, July 1994 Model 40 User Guide

Page 8 Studio Technologies, Inc.

mix, solving the classic problem of wanting

“more me” in the phones! Like the Model

35, the Model 38 is linked with a Model 40

Central Controller by a single cable.

Model 38 Back Panel

LOOP THRU

MODEL 38 TALENT AMPLIFIER

MADE

U.S.A.

TALENT LOOP THRUIN LEFT/MONO IN RIGHTLOOP THRU IN

CUE MIX (FROM CENTRAL CONTROLLER)

STUDIO TECHNOLOGIES, INC., SKOKIE, IL U.S.A. (708) 676-9177

PUSH

PUSHPUSH

Connects to talent

sources such as key-

boards or microphones

Loop thru connectors parallel the

talent inputs for routing to a digital

audio workstation, effects device,

microphone preamp, etc.

Connects to the Model

40 or another talent

amplifier’s loop thru

connector

Connects to additional

talent amplifiers

TALENT CUE MIX

HEADPHONE

OUTPUT

STEREO

MIC

LINE

POWER

LEVEL LEVEL

MONO (L) MONO (L+R)

Switch between stereo

and mono (L+R) for

the cue mix

Two headphone

outputs

Model 38 Front Panel

Cue mix level

to phones

Switch between

stereo and mono

(L only) for the

talent input

Talent level

to phones

Mic/Line button switches

the talent input between

microphone and line level

Power

present LED

Model 40 User Guide Issue 1, July 1994

Studio Technologies, Inc. Page 9

Installation

In this section you will be installing the

Model 40 Central Controller in an equip-

ment rack. Audio input connections will be

made. Wiring will be installed to allow

Model 35 or Model 38 Talent Amplifiers to

be connected. AC mains power will be

connected to the Model 40.

System Components

The main StudioComm shipping carton

contains a Model 40 Central Controller,

User Guide, and warranty card. Units

destined for North America are shipped

with an AC mains cord. Your dealer or

distributor will provide an AC mains cord

for non-North American destinations.

Model 35 and Model 38 Talent Amplifiers

will be contained in separate cartons.

Please check to ensure you have every-

thing you need.

Sample Installation

Please refer to the following page for a

diagram detailing a possible Model 40 and

talent amplifier installation.

Mounting the Model 40

The Model 40 requires one space in a

standard 19-inch (48.3cm) equipment

rack. It is desirable to locate the Model 40

to allow easy access to both the front and

the back panels. The back panel contains

the input and output connectors, while the

front panel contains several controls,

switches, and LED indicators. The Model

40 is secured to the equipment rack using

two mounting screws per side.

Audio Inputs

The Model 40’s line-level audio input

connections are made using ¼-inch

3-conductor phone jacks. Don’t be con-

cerned about damage to your audio quality,

the jacks we use are manufactured by

Neutrik of Switzerland and feature gold-

plated contacts for excellent performance.

Caution: For reliable audio interconnection,

the plugs you use must comply with industry

standard RS-453. Switchcraft No. 297,

Neutrik NP3C, or equivalent will work cor-

rectly. Refer to the Technical Notes section

for details.

Stereo Line Inputs

The Model 40 allows two stereo line input

sources to be connected. During operation

either talent amplifier output group can

select either of the stereo inputs as its

source. This allows flexibility in routing the

desired source to the desired group of

talent amplifiers. In some installations only

one stereo source may be available. In this

case the one stereo source should be

connected to input 1. For future use it may

be wise to connect input 2 to points on a

patch bay. This will allow rapid connection

of another audio source should the need

arise.

The input circuitry is electronically balanced,

and is compatible with balanced or unbal-

anced signals that have a nominal level

range of –10dBV to +10dBu. The input

impedance is 50K ohms so that compatibil-

ity with virtually every source is assured.

Prepare the input plugs so that tip is posi-

tive (+ or hot), ring is negative (– or cold),

and sleeve is shield. The input jacks will

also accept unbalanced ¼-inch 2-conductor

phone plugs. With unbalanced phone plugs,

tip is positive (+ or hot) and sleeve is shield.

If 3-conductor phone plugs are used to

connect unbalanced input signals, connect

positive (+ or hot) to tip and shield to ring

and sleeve.

Issue 1, July 1994 Model 40 User Guide

Page 10 Studio Technologies, Inc.

Example Installation

Model 35 Talent Amplifiers

Model 40 Central Controller

Recorder/Reproducer

Model 38 Talent Amplifier

Output Group 1

Output Group 2

Total of eight headphones per group

Model 40 User Guide Issue 1, July 1994

Studio Technologies, Inc. Page 11

If one or both audio sources is monaural

several installation options are available:

• The mono signal is wired to both the

left and right inputs, thus sending

two channels of audio to the talent

amplifiers. This installation is simple,

but prevents the rapid connect of a

stereo source should the need arise.

• The mono source is connected to the

left input only. As both the Model 35

and Model 38 Talent Amplifiers contain

a monaural switch, talent amplifier

users can select to hear the signal in

both channels. This has the downside

of possibly confusing users who don’t

know to press the mono button.

• Our preferred installation has the left

and right inputs connected to points

on a patch bay. The mono source

would be connected to the “normal”

connections on both the left and right

patch points. This would feed the

mono signal to both the left and right

inputs, while giving the ability to

quickly “patch in” a stereo source.

Talent Amplifier Outputs

The Model 40 contains two talent amplifier

output groups which are designated Group

A and Group B. Each group will support up

to four Model 35 or Model 38 Talent Am-

plifiers in any combination. Two male XLR-

type connectors are provided on the Model

40’s back panel for connecting to the

output groups.

For best performance, use low-capaci-

tance shielded microphone-type cable to

distribute the output groups. If you have a

choice, select cable with the heaviest wire

gauge commonly available. This will re-

duce voltage drop when using long cable

runs. Refer to the Technical Notes section

for additional information.

The simplest installation would use micro-

phone cables to connect the Model 40 to

the first talent amplifier in each group; the

loop through connector on the first talent

amps sending the signal on to the next.

For convenience, you may want to wire

your facility to allow easy access to the

output groups at all locations where talent

amplifiers might be used. Talent amplifiers

connect to an output group in parallel, so

the connectors on the distribution panels

or mult boxes must be wired in parallel.

Warning: Do not connect talent ampli-

fier output signals to anything but Studio

Technologies’ talent amplifiers. Some

audio equipment may be damaged by

the +23Vdc contained on pin 2 of the

talent amplifier output group connectors.

Balanced Input

Connection

Sleeve

(Shield)

Ring (–)

(Switchcraft No. 297, Neutrik NP3C, or equivalent)

Unbalanced Input

Connection

Sleeve

(Shield)

Tip ( + )

(Switchcraft No. 280, Neutrik NP2C, or equivalent)

Tip ( + )

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