They don't treat all the frequencies in that range the same, though a speaker or a pair of headphones might be able to output sound across the full frequency range, but the amount of power they put behind each frequency varies. Headphones and speakers are typically built around this range, with most able to output between 20Hz and 20kHz. Additionally, some of the very low frequencies might not be audible at all, but you might physically feel them if they're loud enough. That range is a general guideline, however, and the upper limit of audible frequencies typically declines as you age infants can hear at frequencies slightly higher than 20kHz, while adults might be unable to hear anything above about 15kHz. Seriously low frequencies produce deep rumble, while the highest frequencies produce uncomfortably shrill sounds. The range of human hearing spans roughly from 20Hz to 20kHz. Thus, a frequency of 1Hz is the equivalent of one vibration per second, and a frequency of 1kHz is equal to one thousand vibrations per second. Frequency represents the number of cycles (or sonic vibrations) per second, and is measured in Hertz (Hz). Let's start with one of the most important terms when dealing with EQ settings: Frequency. Understanding the Terms: Frequency and Response To get the best results from an EQ, though, you first need to understand how it works. An EQ is a tool for recording and mastering music, but anyone can use one to adjust the sound signature of their headphones or speakers via an app or physical controls. Not everyone has an audio engineering background, but thankfully, you don’t need one to reap the benefits of an equalizer (or EQ).

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