PSA is using inherently expensive technology. The only company I know of using a ribbon midrange is Piega from Switzerland. They have been doing it for 30 years and make the drivers themselves. The smallest bookshelf speaker with their ribbon mid/tweeter driver is £5,000, and it was originally £6,200, about $8,000. It’s called COAX 311. Their line array speaker costs something like $150,000.
They introduced a cheaper speaker around the $2,500 mark, it does not have the ribbon midrange, it is a more conventional mid/bass and ribbon tweeter. There are cheaper alternatives like the Quad S2.
KEF have been based from the same factory for 60 years and have 70 years of research experience. Many companies have used their drivers, including Wilson and the BBC. Their current success is with a dual concentric driver called Uni-Q that first appeared in 2008, you will find it in the R3, Reference 1, Blade, LS-50 and LSX. They are are owned and made in China.
So if you look at other brands, I don’t think you will ever see a cheap midrange ribbon speaker, certainly not below $5,000. I was expecting the Sprout speaker to be like the Quad S2 with a ribbon tweeter and around $1,000.
For comparison to the FR-30, the Piega COAX 711 is much more expensive at $25,000, although it made out of solid aluminium.