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Surface Mount Loudspeakers

Line Matching Transformer Connections

The SM42T, SM52T, and SM82T include a two pole barrier strip housed by a weather-resistant cover. The barrier strip is designed to

accept either spade connectors or bare wire. We recommend #18AWG for wire runs up to 500', 16AWG for wire runs of 500' to 1000',

and #14AWG for runs over 1000'. Building codes often dictate that speaker wire must be plenum rated or run in conduit. Be sure to

check your local codes before installation.

The SM42T, SM52T, and SM82T are equipped with line matching transformers. These types of speakers require an amplifier capable of

driving a 70.7V line in order to ensure that the wattage taps selected will be appropriate. If your amplifier is not rated for 70.7V output,

you may use the Atlas Sound AF140 autoformer configured as a step-up transformer for this purpose. Contact your dealer for details.

Connect the speaker cable to the + and – barrier strip terminals on the back of the SM42T / SM52T / SM82T.

Using a small screwdriver, adjust the wattage selector switch on the back of the SM42T / SM52T / SM82T to the desired wattage tap.

CAUTION: DO NOT SET SWITCH TO 8Ω POSITION WHEN SPEAKERS ARE WIRED IN 70.7V / 100V SYSTEMS

Quantity of speakers per amplifier will be dictated by the amplifier's wattage rating (at least 20% headroom should be allowed for

extended range program material such as paging or digital music sources) i.e. a 120W amplifier will power six speakers tapped at 15

Watts each. (90 Watts total on line + 20% headroom = 108 Watts, total<120W). (See Figure 2)

Maintenance and Care

Atlas Sound Surface Mount series loudspeakers have been designed and manufactured for years of trouble-free service.

You can clean your Surface Mount series loudspeaker with a dampened soft cloth or paper towel. If the speaker is mounted high on

a wall or ceiling, use a broom or duster to gently brush it off. Spraying the speaker with high-pressure water is not recommended and

will void the warranty.

Input

Atlas Sound AA120 Amplifier

120 Watt

70.7V Output

AtlasSound.com

Figure 2

6 X 15 Watt = 90 Watts Total Load On Amplifier

15 Watt Tap

1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.

Telephone: 800.876.3333 • Fax: 800.765.3435

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Specifications are subject to change without notice.

Owner's Manual

15 Watt Tap