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What is the efficiency of a horn type loudspeaker?

What is the efficiency of a horn type loudspeaker? Correct Answer 30 to 50%

The horn acts as an acoustic transformer. This allows better impedance match between low impedance of the free air and the high impedance of the vibrating voice coil assembly. This results in increased efficiency. The efficiency of a horn type speaker is 30-50% as against only 5% efficiency of cone type speaker. But the sound produced is not natural.

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