Bogen UTI312 User Manual download pdf (Page 1)

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SYSTEM DESIGN GUIDE

70V Paging Systems consist of:

• A Centralized Amplifier which offers a variety of features

to enhance voice and music reproduction as well as easy system

expansion.

• Speakers that connect with a simple 2-wire installation because

the audio power is supplied from the centralized amplifier.

• An Interface Device that connects the paging system to the

telephone system. (Depending on the telephone system and

amplifier, an interface device may not be needed.)

The aim of a paging system is to deliver important audio announce-

ments to people working in a facility at the proper level and with

sufficient clarity to make the announcement easily understood.

The two most common ways to accomplish this is to use either

70V centralized amplifiers with passive speakers or self-amplified

speakers operating from a 24V DC power supply.

Pages 64-67 explain 70V systems and pages 68-69 explain self-

amplified systems. Speaker layout, wiring methods, and phasing are

the same for either technology and are covered on pages 70-73.

What Is A 70V System?

Low Currents Allow Long Runs

Why do distributed sound systems use centralized amplifiers with 70V

output signals? Because 70V systems can handle extremely long

lengths of wire to connect the speakers to the amplifier,

and they can power a large number of speakers in each system.

When sending power signals over long distances, it is important to

minimize the amount of current flowing in the wire. High currents

allow too much power, or electrical energy, to be wasted in wires in

the form of heat.

The power (P) lost in the wire is related to the square of the current

(

), so reducing the current in the wires a little reduces the power

lost in them considerably. In fact, reducing the current flowing in a

wire by a factor of 2 will reduce the power loss by a factor of 4.

However, the power the load demands and the output level of the

amplifier determines the amount of current that must flow in the

speaker wires (Ohms' law in action).

So to lower the amount of power lost in the wires, the voltage that

the amplifier uses to drive the load is increased. By doing this, the

current in the wires can be reduced while still supplying the same

power to the load (for the same power P, any increase in V will lower

Of course you cannot just change the voltage driving a load from one

level to another without also making the load compatible with the

new voltage level.To ensure compatibility, 70V systems use transform-

ers on the speakers that change the high 70V amplifier output levels

to lower levels that are compatible with typical 8-ohm speakers.

Easy To Control Speaker Power Draw

The output of a central paging amplifier is designed to limit the

maximum output voltage that can be supplied to the speakers.

This maximum output voltage remains the same regardless of the

amplifier’s power capacity. Because the output voltage is limited,

speaker manufacturers can design products that consume a specific

amount of power from the amplifier.This is beneficial in two ways.

First, the speakers will not consume more power than they are

designed for; so, they cannot blow out from using an amplifier that’s

too powerful. Second, since each speaker’s power consumption is

known, the correct amplifier power for the paging system is simply

the total power drawn by all the speakers.

BGM

PAGING TIMEVOX DELAYTONE VOL.

MIN MAXMIN MAXMIN MAX

TAM B

TELEPHONE ACCESS MODULE

BOGEN

RAMSEY, N.J.

COMMUNICATIONS

VOX ENABLE

VOX DISABLE

PREANNOUNCE TONE

S3 S4

CONFIRMATION TONE

48VDC PWR SUPPLY S1,S2

24VDC PWR SUPPLY S1,S2

ONOFFMODE

RINGER EQUIVALENCE: 1.2 B

CD23CH-17705-KX-N

FCC REGISTRATION NUMBER:

COMPLIES WITH PART 68, FCC RULES

VOL

BGM

SWITCHES

MODE

(0.1A)

(TRUNK ACCESS ONLY)

POWER SUPPLY

CONTACT CLOSURE A

PAGING OUTPUT

EXT VOX ENABLE

PHONE SYSTEM

-24/48

+24/48

COM

N.O.

-M

PEAK LEVEL

POWER

BOGEN

MODEL TPU AMPLIFIER

ALC

TEL VOLUME

MIC VOLUME

MUSIC VOLUME

MUSIC MUTE

RINGER VOLUME

VOX SENS

BASS

TREBLE

APHEX

TAM B

CENTRALIZED AMPLIFIER

TPU 100

SPEAKER

S86T725

Why Use 70V Outputs?

Paging System Technology

Central-Amplified Systems - pages 64-67

Self-Amplified Systems - pages 68-69

Power Lost

In Wires

(Watts)

Resistance

of Wire

(Ohms)

Current Flowing

In Wire

(Amps)

P = I

Current Flowing

In Wire

(Amps)

Amplifier

Output Voltage

(Volts)

Power Needed

By Load

(Watts)

I = P / V

1 2 3 4 5 6 ... 13 14

Summary of Contents

Page 1 - Paging System Technology

www.bogen.com64SYSTEM DESIGN GUIDE70V Paging Systems consist of:• A Centralized Amplifier which offers a variety of features to enhance voice and musi

Page 2 - Amplifier Output Types

www.bogen.com73SYSTEM DESIGN GUIDESpeaker WiringSpeaker Wiring PatternsBecause distributed paging systems involve a great number ofspeakers and long d

Page 3 - Amplifier Input Types

www.bogen.com74SYSTEM DESIGN GUIDEWire TypesSpeaker WireThe speaker wire best suited for paging systems is 2 conductors in a jacket.The gauge of the c

Page 4 - Amplifier Selection

www.bogen.com75SYSTEM DESIGN GUIDEWire-Related LossesMaximum Wire Run Cable Length (ft.)Wire Loss In Central Amplifier SystemsOnce you have an idea of

Page 5 - Understanding Current Units

www.bogen.com76SYSTEM DESIGN GUIDETelephone InterfacesThe most common way to make announcements over a paging system is through the telephone system.

Page 6 - Power Supply Capacity

www.bogen.com77SYSTEM DESIGN GUIDETypical Ambient Noise Level Typical EnvironmentsSound Pressure Levels ChartVery HighNoiseHighNoiseMediumNo

Page 7 - Speaker Layout

www.bogen.com65SYSTEM DESIGN GUIDE70V OutputA 70V output is available on Bogen amplifiers and is the primarytype of output for paging systems.A step-u

Page 8

www.bogen.com66SYSTEM DESIGN GUIDEAmplifier Input TypesAuxiliary Input (AUX)The Auxiliary input is the most common type of input used inpaging.This in

Page 9 - Site Survey Check List

www.bogen.com67SYSTEM DESIGN GUIDEDesigning 70V Systems# ofSpeakersSpeakerCoverageTotal Area (Sq. ft.)÷=CEILING SPEAKERSModels CSD1X2, SM4T, S86/S810T

Page 10 - Speaker Phasing

www.bogen.com68SYSTEM DESIGN GUIDESelf-Amplified Paging Systems consist of:• Self-Amplified Speakers each contain an individual, built-in,miniature am

Page 11 - Wire Types

www.bogen.com69SYSTEM DESIGN GUIDEWhat Makes A Self-Amplified Speaker?Built-In AmplifierAs the name suggests, all self-amplified speakers contain thei

Page 12 - Wire-Related Losses

www.bogen.com70SYSTEM DESIGN GUIDESpeaker LayoutHorn LoudspeakersDesired mounting height, barring obstructions, is 15 to 20 feet,with the speakers ang

Page 13 - Loop And Ground Start

www.bogen.com71SYSTEM DESIGN GUIDESpeaker Layout20’ to 60’10’20’SPEAKERWALLSTARTB=20 feetA=10 feetABSPEAKERSTART• Hallway/RoomWall baffle speakers wor

Page 14 - Sound Pressure Levels Chart

www.bogen.com72SYSTEM DESIGN GUIDESite SurveyThis Site Survey Check List will help to determine the paging system equipment needed for installations.

Bogen UTI312 User Manual Page 1

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