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Thank you to Bruce Woolley and Jalam 1001
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Wouldn’t you just love to toss a pebble into one of those listening horns!
That is just insane… can you imagine the level of concentration… and the pain if someone screamed into it… lol
try googling “Denge sound mirrors” the ultimate in 20s high-tech
Note to Retronaut: create capsule on Sound Mirrors