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Hearing Test in HD quality. Sinusoidal wave starting at 20 Hz frequency and going up to 20 kHz frequency. It's recommended that you listen to this using headphones. If you can't hear anything above 16000 Hertz it's probably because Youtube's audio compression cut off frequencies above 16kHz. Try watching in HD to get better audio quality. Update: Youtube no longer seems to cut of frequencies above 16kHz at least when encoding as opus audio stream. There is still lossy compression and there are visible distortions at high end of the spectrum (high frequencies). If you don't hear low frequencies it's your hardware! Most decent headphones should be able to play low frequencies, for loudspeakers check their specification. They could have frequency range (min) starting at 40Hz or 80Hz or in case of build in laptop/tablet speakers 120Hz or higher. For other end of the spectrum (high frequencies) it's more sophisticated. Again, it's best to liste
