Anyone who has heard the RCA field coil 1428/1443 drivers will tell you they are the best for midrange reproduction. With a wide frequency response of ~300 - 7500 Hz, they reproduce everything from the subtlety of a finely nuanced passage to the complexity of a massive orchestra.
They are built like a tank, weighing about 50 LBS per driver, and that’s without the horn! They don’t make them like they used to.
They come up on eBay every so often for about $7500 for a pair. Horns (conical are best - no coloration) run a few thousand. And you need to add an upper bass and sub.
Don’t know how to insert photos here, or I would show you my 3 way system that is based on the 1443s.