Line arrays have appeared several times over the years and most have been very interesting and very good. Pipedreams come to mind.
But the latest and most interesting are Arions. I have a Mundorf AMT in my Tetra 606s. Dipole, they produce open and clear trebles. In the YouTube from the Florida Audio Show, the sound I heard from the Arion/Audio Research room was beyond any of the others from this show. This was especially evident in a drum solo on a LP. The presence and impact was unlike any I have heard. This lead me to exchange several emails with Arion and brought me to the point of almost going to Charlotte. If I ever wanted to change speakers, Arion would be on the top of my list.
Even only hearing a MP4 YouTube!