NotchedSingle tone
9,000 Hz tone
9,000 Hz is close to the note C#9 (A4 = 440 Hz), in the range of the fizz on top of a cymbal and air hissing through teeth. 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 9,000 Hz.
Pitches an octave apart sound alike, so people often land exactly one octave off. How pitch matching works
About this pitch
9,000 Hz sits about 25 cents above C#9, which is 8,870 Hz. The nearest piano key with the same note name is C#7 (2,217 Hz), two octaves lower. One octave down from this tone is 4,500 Hz. It is about 1.1 octaves above C8 (4,186 Hz), the top key on a piano. How well people hear this pitch varies a lot, and some laptop speakers and earbuds play it weakly. If it seems faint, try headphones before turning it up.
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.