Karl: Thanks for the history lesson...I forgot the transmission line drivers were named after Walsh. Those things were quite expensive back in the day. They did come out with smaller, less expensive OHM Walsh speakers, but the model numbers escape me (the driver looked like Abe Lincoln's top hat, not the dunce cone hat look of the F's driver.
The other Ohm's I spoke of are Ohm I's. They didn't image as well as the Walsh's, but they were bi-ampable and shook the floor (Ohm claimed over 120dB of dynamic range and 1000W of power handlling capability!). My rich buddy bought those and the Adcom GFA-1 cube power-amp with a Nikko pre-amp (all from Tech Hi-Fi)at my recommendation back in the day ('80 or '81)and they were AWESOME! I wanted that set-up in the worst way.
David: I remember those Infinity's, but can't for the life of me remember the model #. It sucks to get old, LOL! Where's BkBass Barry when you need him? He's a bigger Infinity nut than I am! Yes, SOM/Karl has what I believe are the first Walsh-type speakers, and they were designed and sold a quarter of a century ago! That driver is/was huge! I am not aware of any manufacturer currently producing a loudspeaker utilizing Walsh Transmission Line drivers.
Cheers Mates,
Kevin