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A megaphone is a re-entrant horn loudspeaker at one end, a microphone at the other end and a 3W to 15W amplifier in between. They are very loud and are used by a person talking to a crowd of people. The re-entrant horn loudspeaker is very efficient from 500Hz to 4kHz and sounds horrible.

70W to 100W is rediculous because it will be so loud that the mic will hear the speaker and cause acoustical feedback howling so loud it will deafen everybody.

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