Side note: Lower freqs travel farther (in general), but the problem is that they don't have directionality. That is why you can place a subwoofer anywhere. The direction of a higher freq can be determined much, much easier. As always there are exceptions to every statement.
Anyway, it will be interesting to what price they carry the whistle at.
My $.02
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"Its not a matter of being ready as it is being prepared" -- B. E. J. Taylor