🎧 Use good headphones or full-range speakers. Start at a low volume — sine tones at high volume can damage hearing fast, especially above 10 kHz.
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Manual tone
Your hearing limits
Lowest audible—
Highest audible—
Audible span—
Age-typical ceiling—
Healthy 20-year-olds hear up to ~18-20 kHz; this drops ~2 kHz per decade (presbycusis). A 1 kHz ceiling likely means your speaker is rolling off, not your ears.