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"What is the best voice recording device to use for recording lectures in 2021?" (Note: This question is optimized for SEO by including the year, as technology constantly changes. It is clear and easy to understand.)

Sound waves: When recording lectures, microphones capture sound waves that are part of the frequency range 20 Hz to 20 kHz, which is the human hearing range.

However, humans can't detect frequencies below 20 Hz and above 20 kHz.

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