"I remember it like it was yesterday: sitting in my car, cranking up Van Halen's 5150, and spending the entire album fiddling with the 10-band EQ I'd installed to get the best sound possible. You don't see a lot of physical equalizers these days, which is sad because they were always so cool to have. Instead, most everything is software-driven now. And that's fine. It may not be "audiophile-level fine," but at least it's something."
"One way sound is measured is in terms of periodic vibrations, measured in hertz (Hz), which is the property of sound that determines pitch. Humans have a finite range of frequencies they can hear, specifically, 20 to 20,000 Hz. Those frequencies are broken into octaves which are: 16 - 32 Hz - the lowest notes humans can hear. 32 - 512 - the frequencies of rhythm (lower and upper bass notes)"
Equalizers adjust specific frequency bands to shape audio by boosting or cutting targeted tones. They compensate for speaker limitations and room acoustics to produce a more balanced sound. Humans hear roughly 20 to 20,000 Hz, and those frequencies are grouped into octaves covering sub-bass, bass, mids, upper mids, brilliance, and beyond human hearing. Lows cover the first octaves, mids include voice and labial/fricative ranges, and highs contain cymbals and sibilance. Physical equalizers have largely given way to software-based EQs, which allow easy tuning across multiple bands to enhance clarity and reduce unwanted noise.
Read at ZDNET
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