Berlin: An echo by Shofar is not Yotzei because you are not hearing directly from a Shofar. It’s still a musical instrument. One wouldn’t be allowed to play a horn in a cave on Shabbos or Yom Tov. You’re missing the point that this Minhag to Asser it is late only because until recently everyone assumed it was Assur all year round anyway. To be Holeich Achar Hameikil here you would first need a legitimate opinion Lehakel.
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