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Original Message

under what physical properties is it effective?

Posted by Story on July 16, 2020 at 04:40:37:

high/low humidity? Type of carpeting/no carpeting? Cement/wood flooring? Basement or higher up? Throw rugs?

It would be scientific for someone to clear up the myths involved. I would find it hard to believe that it is clearly audible under all conditions. I have tried it but reserve any comments/opinions.

Does anybody have research or data on the subject? Citing experience under one's own condition is not definitive.