PMC are a British speaker firm, taking the world by storm in Europe right now.
They are seriously twisting B & W tail in the professional market. They have partnered with Bryston to produce active speakers.
There designs are largely aperiodically damped transmission lines. As far as I know they are the only speaker firm producing the traditional TL that I favor above all others. The small offerings are labyrinths. They seem to have picked up the mantle from TDL.
I have not heard these speakers, but have heard nothing but good about them, and they have garnered some rave reviews.
The
speaker you are looking at has bass extension to 28 Hz from a 6.5" diameter cone.
I would give these speakers a listen and seriously consider them.