I had a 15-band EQ in a tape loop of my receiver in my first system back in 1982. I think it was a BSR or ADC. Back then I wanted as many components in the rack as possible....more drivers, more watts, more volume, read the specs, etc. The system cranked! ...guess I was a wannabe DJ, LOL! 🤘 😎
It’s not something I would add to my system now. It adds another component plus two sets of cables to the equation. I do have some gain/volume and bass controls on my woofers and subwoofer below 80hz that I can adjust as needed, but nothing in main signal path to the mids and tweeters.