All speakers have a little EQ built in

My favorite speakers, JBL 4311, have a simple dividing network with volume controls. 2 capacitors and Lpads. Yes, over time the Lpads need cleaning, but devoting a couple of hours every 10 years isn’t a big deal. 

The drivers, cabinet, and crossover were designed to work together as is. The 3 drivers overlap in frequency response above 1500hz with no inductors choking them off. Additionally, the midrange driver is built with polarity reversed. This is a common technique JBL engineers used in various models. 

These were the most popular studio monitors among recording engineers of all genres during the 1970s. They fell out of favor for mixing because they sounded too good and didn’t translate well to average consumer models, but many engineers used them at home for that very reason. 
 

JBL engineers eventually succumbed to the marketing department and designed more complex crossovers in future models. They sound great but don’t have the dynamics of the 4311. It’s a unique and special speaker. 
 

I should add that I tried a Schiit Lokius in my system. It’s not bad, but it does change the sound even set flat. The bypass works, but engaging it immediately affects the sound. I returned it. 

@mbmi 

When I auditioned it, I primarily used the low end adjustments but unfortunately it also affected the high end, making bright recordings sound brittle. And I’m not going to use an equalizer to correct problems introduced by the equalizer. I was disappointed. High quality equalizers shouldn’t do that. 
 

@lanx0003 

Digital eq is the way to go for most. Studio quality PEQs can sound great but are best used for production, not reproduction. Most studios stopped using room eq long ago because of the issues you mentioned.