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The author may have been mistaken, but they were almost certainly simply stating what they thought of as fact, there's no need to accost them

Sorry, edited.

I have a 384kHz DAC and I can safely say that I have no dolphin capabilities.

At what dB and how much are you annoying nearby dogs?

Not sure to both. I haven't measured. I used a 1kHz tone to calibrate the volume to a comfortable level and then raised the frequency until I couldn't tell whether the tone was playing or not.