Bogen UTI312 User Manual download pdf (Page 6)

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SYSTEM DESIGN GUIDE

What Makes A Self-Amplified Speaker?

Built-In Amplifier

As the name suggests, all self-amplified speakers contain their own

miniature amplifier.These amplifiers range in size from 1 watt, which

are used on cone speakers, up to 15 watts, which are used on the

SAH15 and AH15A horn speakers.

Bogen’s latest line of self-amplified horns use a revolutionary digital

switching amplifier. Unlike conventional analog amplifiers, this

advanced technology produces very little heat when it operates.

It produces so little heat that all it needs to dissipate the waste heat

are the copper interconnecting traces on the printed circuit board

instead of the typical large aluminum heatsinks. Because it produces

so little heat it also draws considerably less power from the power

supply. Why? Because it is not wasting half of the power supply energy

it consumes as heat.

More typical in the industry are speakers that employ analog amplifiers,

which produce considerable waste heat while operating.They typically

release half the 24V power they consume in the form of heat, and

heat is a major contributor to the failure of an amplifier.

The amplifiers in Bogen’s AH series of self-amplified horns are analog

but rid themselves of waste heat through their large cast aluminum

end bell that works as an excellent heat sink, quickly and effectively

removing excess heat. Competitve products using plastic end bells

don’t have this cooling advantage.

4 Wires

All self-amplified speakers require 4 wires to make the necessary con-

nections.Two of the connections are used to provide 24V DC power

to the built-in amplifier.The other connection pair to a self-amplified

speaker is for the audio signal input.

The general audio signal level is the same as what you would find on any

analog telephone line.The input is transformer balanced, also similar to

the inputs found on telephone systems.The balanced nature of the input

greatly reduces interference and noise caused by equipment running in

the facility

.The use of an actual transformer provides electrical isolation

between

the input leads and the actual amplifier, which protects it from

ground loops and RF interference, and provides an all-around rugged input.

Designing Self-Amplified Systems

# of

Speakers

Speaker

Coverage

Total Area

(Sq. ft.)

CEILING SPEAKERS

Models ACD2X2, ASWG1, ASWG1DK.

To determine the number of ceiling speakers your

installation requires, simply divide the area’s total

square footage by the speaker coverage as

indicated in this chart.

HORN LOUDSPEAKERS

Models AH5A, SAH5,AH15A, and SAH15

To determine the number of horn loudspeakers

your installation requires, simply divide the area’s

total square footage by the speaker coverage for

the noise level in the area as indicated in the

chart below.

WALL BAFFLE SPEAKERS

Model ASWB1

To determine the number of wall baffle speakers

your installation requires, simply divide the

area’s total square footage by 600 square feet.

Ceiling

Height (ft.)

Coverage

(sq. ft.)

8 250

10 400

12 580

14 780

# of

Speakers

600

Sq. ft.

Total Area

(Sq. ft.)

SAH5A, AH5A

Low Noise

(55 dB-65 dB)

Medium Noise

(65 dB-75 dB)

(75 dB-85 dB)

High Noise

(75 dB-85 dB)

Very High Noise

(85 dB-95 dB)

8050 LOW

HIGH

LOW

MEDIUM

HIGH

Coverage

Volume Setting

Ambient

Noise Range

Medium Noise

SAH15A, AH15A

6955

6500

2600

# of

Speakers

Speaker

Coverage

Total Area

(Sq. ft.)

Figuring out how many speakers you need for your application is simple.

• For Bogen’s Ceiling and Wall Baffle Speakers, you will need room dimensions.

• For Bogen’s Horn Speakers, you will need room dimensions and ambient noise levels.

Determining

Quantities

Determining

Power Supply Capacity

To determine total 24V DC Power Supply

size requirement use the equation below.

1. Add all the numbers of the Self-Amplified speakers and volume controls together.

2. Select a Power Supply (or power supplies) with a number(s) equal to or greater than the total amount.

For more information on see pages 21 and 68.

See page 28 for

Power Supply

Selection.

See page 75 for

Maximum

Wire Lengths

Coverage is 600 sq. ft. per speaker

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Bogen UTI312 User Manual Page 6

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