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There are different types of megaphones - you are speaking here of a non-electric acoustic horn that amplifies a voice. Electric megaphones or amplifying music would be very different (but are explicitly addressed by R Rozen below) I didn't find responsa formally addressing megaphones. However here are relevant halachot which relate to your question (taken ...


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Shu't Shvus Yaakov chelek 3 siman 31 seen here on the bottom of the first column discusses a type of device which was able to carry someone's voice many מילים away. He says he never heard anyone who raised an objection to using this device on Shabbos. וביחוד על ידי כלים המיוחדים לדיבור ומשמעים קול על כמה וכמה מילים בריחוק מקום יחול אדם לדבר עם חבירו דבר זה ...



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