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Consumer Electronics by S. P. Bali

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SPEAKER MATCHING SYSTEMS

Speaker matching systems permit higher operating efficiency in audio power systems. The 70.7 volt system is preferred for high-power PA networks. Fig. 26.15 illustrates such a network for three speakers. A matching transformer is installed to match a speaker or a group of speakers to the 70.7 volt line. This is called a constant-voltage system because the line voltage is comparatively unaffected by switching speakers on or off. Network calculations are as follows :

  1. Determine the power rating of each speaker.
  2. Add the power rating to find the total power demand and use a 70.7 volt amplifier with a rated power output at least equal to this demand.
  3. Select a 70.7 volt matching transformer for each speaker, or for each group ...

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