Bedienungsanleitung Samson ZM125 (Seite 11 von 20) (Englisch)

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Designing an Installation Plan

Using A Constant Voltage Speaker System - continued

The same principle is applied in constant voltage

audio systems where a transformer is connected to the

amplifier’s output to step up the voltage while lowering

the output current, which allows you to use long runs of

smaller gauge wire to connect to a series of speakers with

step down transformers. For further cost savings, the 70

volt standard was adopted in the US since UL requires the

use of conduit on lines over 100 volts peak. In addition

to 70 volt operation, the ZM Series amplifiers can also

operate 100 volt systems which is a standard in Europe.

Commercial sound systems, like those installed in schools,

office buildings and restaurants, commonly make use

of constant voltage distributed sound systems when a

large number of ceiling speakers are used to cover several

different sound zones.

Today, there are a large number of installation speakers

available from various manufacturers that include

onboard transformers for constant voltage systems.

Many of these models, like the Samson dB300i, include

selectable power taps on the transformer allowing you

to distribute the power efficiently through the number

of installed speakers and also adjust some speakers to

different output levels. The ZM Series amplifiers have built

in transformers on each channel that step up the output

voltage and reduce the current allowing you to connect

to a series of speakers with step down transformers over

long cable runs. Constant voltage systems can use 14 to

18 gauge wire, while smaller gauge (larger diameter) cable

should be used for longer runs.

A simple way to think about using constant voltage is to

divide the total watts available by the number of speakers

you want to use. You could also add up the speaker's step

up transformer wattage to equal 100 watts or less. For

example, if you want to use ten ceiling speakers on one

channel of the ZM Series amplifier, use a ceiling speaker

with a 12-watt transformer tap (120 watts divided by 10

speakers equals 12-watts per speaker).

Typical ceiling speaker with onboard transformer and six

power taps. These power taps also control volume level for

sound balancing.

Another example is connecting four of the Samson

dB300i with the transformers wired for 25 watts to

each channel of the ZM Series amplifier.

Following the wiring diagram on the rear of the

dB300i, connect the ground to Common, the Hot lead

to 70 volt input, and finally, run a jumper from 8 ohms

to the 25 watt connection as shown in the diagram

below.

Set up each of the dB300i they same way so that the

four connected speakers equal 100 watts.

The dB300i's rear panel is configured for 70 volt 25 watt

operation.

Now connect the four speakers to each of the

ZM125's output as shown in the diagram below.

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