NotchedSingle tone
4,000 Hz tone
4,000 Hz is close to the note B7 (A4 = 440 Hz), in the range of the bright edge of a referee's whistle and the top notes of a piccolo. People who hear a tonal ringing often compare their sound with tones like this.
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Is your sound higher or lower? Play a neighbour, then go back to 4,000 Hz.
Pitches an octave apart sound alike, so people often land exactly one octave off. How pitch matching works
About this pitch
4,000 Hz sits about 21 cents above B7, which is 3,951 Hz. B7 is one of the highest keys on a piano. One octave down, 2,000 Hz, is near B6. It is just below C8 (4,186 Hz), the top key on a piano. Most headphones and speakers play this pitch well, but how loud it seems still varies a lot from person to person.
Not sure this is your pitch?
A guided match sets levels for your ears, checks the octave and gives you a range. It takes about four minutes.
Notched is a Mac app that filters a one-octave band at a pitch you set out of what your Mac plays.