Obscure companies making excellent speakers?

Mehrakrishan, no field coil speaker is going to be inexpensive. The reason the permanent magnet speakers showed up decades ago is that they are cheaper to make!

The High Emotion Audio speaker is easy to drive but it is not considered high efficiency, like you often need for an SET. PHY makes a great set of drivers that are full-range and high efficiency, you might also investigate Fertin Acoustic drivers, many of which are field-coil.

has anybody heard sculpture horn speaker by CH audio with magnet speaker or field coil drivers

Eventus Audio that uses their SACC (Simulated Anechoic Cabinet Construction) Technology. I have a pair of Phobos and they are absolutely fantastic. Paird up with a Pass Lab amp, and you have a really open soundstage.

Bamberg Engineering Sound Lab
King's Audio Limited KingSound Speakers
Lenehan Audio
PNB Audio
Acoustic Energy
Living Voice
Ohm

I own a pair of PBN Montana XPs. All the above, including Reynaud and Selah speakers previously mentioned are currently on my radar screen to replace my second system.

I've heard the new Bamberg speaker on several occasions. It has extraordinary performance and value. I must disclose it now uses ClarityCaps in crossover as OEM'd by my agency.