Best options for active speakers $4k or below?

Great sounding active speaker Line would be ATC , would need to buy used, as much as you can afford !!!

I second used meridians! they have been doing active dsp a long time and are very easy to use after set up. The used prices are dirt cheap but and the sound is natural. 

Since no one mentioned Salk, I will. High quality manufacturer, smaller company, based in Michigan, well-reviewed, responsive over email or phone, 30 day trial, beautiful to look at. I own some passive speakers and had a great experience with the company owner and products. Be sure to look at some of the veneers he offers, because the active speakers are only  shown in white in the photo, but he has many other options. https://www.salksound.com/model.php?model=PowerPlay%20Monitors

There's some small JBL active that cost $150 at best buy and we use them at work, my daughter uses it to clean house. portable, sturdy, and portable. did i mention they have color options?