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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 listen using headphones, but you also need good Digital to Analog Converter (DAC). If your soundcard uses DSP processor it is best to turn it off and switch to “Stereo Direct“ mode (if it offers such possibility). Also disable any modification to the original signal like equalizers or “bass boost“ in your hardware/software. All these features modify original signal and might distort it to the point that high frequency components will be lost. If you have quality DAC and headphones/speakers and can't hear above certain frequency, then it's most likely your hearing. To be 100% sure ask someone with better hearing (someone younger). Generally, if children can hear it on the same hardware and you can't, it's above your hearing threshold.
