Hear single tones

Each page plays one high pitch and lets you compare it with the pitches a half step and an octave either side. People who hear a tonal ringing often use tones like these to judge whether their sound is higher or lower.

• 4,000 HzNear B7. The bright edge of a referee's whistle and the top notes of a piccolo.
• 5,000 HzNear D#8. A thin, piercing whistle and the hiss at the start of an "s".
• 6,000 HzNear F#8. High "s" sounds and the shimmer of a cymbal.
• 7,000 HzNear A8. The sizzle in "s" and "f" sounds and the shimmer of a cymbal.
• 8,000 HzNear B8. The airy top of a cymbal and the hiss in "s" and "f".
• 9,000 HzNear C#9. The fizz on top of a cymbal and air hissing through teeth.
• 10,000 HzNear D#9. A faint, airy hiss, like the very top of a cymbal crash.
• 12,000 HzNear F#9. A very thin, airy shimmer near the top of what headphones play.

Notched is a Mac app that filters a one-octave band at a pitch you set out of what your Mac plays.