Interesting, but not really surprising to me. Lower frequency sound always travels further than higher- that is why ancient armies used bugles and horns for local commands, but you had to switch to drums or visual signals for any real distance.

The part that surprised me was that the Fox40 Pro didn't do so well.
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-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.