And, as some of you may know, a lot of horns conducive to modding, many sources for attaining your sound preferences. Volti mid horns part of my mods, so, yes Volti another horn to pay attention to. I did try damping my original mid horns, not to my liking, band aid approach, Volti tractrix fit the bill.
Sound staging, imaging was concern of mine coming from Merlins, speakers designed from scratch for maximal ss and imaging. My Klipschorns don't really give up much to Merlins here, even in stock form not bad at all, always strong dimensional phantom center image. With mods, strong aspect of overall performance, and I'm a sound stage, image freak.
My take on horns is timbre purists assume you can't get natural timbre out of horns, not true. Horns come in many flavors, well designed, engineered horns made with natural materials critical in attaining top flight performance here.
Speaking of field coils, couple years ago visited Classic Audio Loudspeakers Brighton Michigan, specializes in field coils. Didn't get a chance to listen as he was leaving for show that particular day. Had lots of JBL cabinets at time I visited, been meaning to return.