Doug, i remember in hifi show very good listening sessions with the lectron.J Hiraga has begun in a French hifi newspaper,then founded a high end DIY hifi newspaper "L'Audiophile" around 19776/77 where they explained how to build 300B amplifier...it was valves and high efficiencies loudspeakers( horns...)
After he designed some product more in the mainstream as Lectron ,and recently he was working with battery powered amplifier... for a Swiss firm.
But he always stayed with his first love as every month one can read his description of big systems (as your can find in Asia and especially in Japan) where sometimes horns for bass ,a few meters long ,are built in the same time as the house, the motor downstairs and the horn (a big hole in the wall)upstairs in the music room.The concrete horn being built with the walls