I've been using these off and on for 5 years to mix on, and I've received a fair number of compliments on my mixes. I don't mind using them at all....and I have minimal treatment going on.
https://www.logitech.com/en-ca/shop/...ers.980-001258
No speakers are flat. You need to put the speakers in your room, measure the room and then treat the room until the measurements are flat. Check out Eric Valentine's "The End Of The Acoustic Rainbow'
https://www.youtube.com/watch?v=6bMyYpS2vwE (and related videos) He goes over a lot on getting your room flat.
Here's one mix that was done on the logitechs, for example. They're easy to connect to your interface, you just need to keep the interface volume decent so you don't overload the input of the logitech system. No one told me it sounded horrible! lol