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Commercial 70 Volt Speaker Systems Info:
When connecting multiple loudspeakers to one power amplifier, such as a paging system, store, office, restaurant, or church background music system, one should consider using a 70-volt speaker distribution system. With a 70v system, one need not be concerned with impedance and each individual speaker has its own in-line transformer, or power tap, which can be set at a certain wattage and thus designates the output level of that individual speaker. To design a 70 volt system, simply choose the number of speakers you desire, each with a built in transformer, then find an mixer amp with the appropriate wattage. To find the necessary wattage of your commercial power amp, you simply add the total wattage taps that speakers are set at and add 20%. Hence, for a simple example, if you have 8 speakers with the 70v transformer tap set at 10 watts ea, 8 x 10 is 80, and leaving your self an extra 20%, you would need about a 100 watt Power Amplifier / mixer.
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