This is out of Ohm Walsh loudspeakers Technical White Paper dated 1981.
((The engineering of single wide-range drivers, such as the original Walsh loudspeaker driver, entails trading off efficiency for bandwidth. Perhaps the single most important compromise is the voice-coil mass decison. A coil, large and heavy enough to provide efficient bass responce, will not provide adequate high-frequency range. Conversely, a low-mass coil with excellent high-frequency performance will not be able to generate large low-frequency excursions. So, while the OHM F is the ultimate embodiment of Walsh technology, it requires substantial power to achieve loud sound pressure levels. Also, while the 360-degree dispersion of the Ohm F produces remarkable stereo imaging., it requires rather careful placement in the listening-room. The Ohm Walsh Loudspeakers utilize unconventional technology to provide a less expensive speaker which is substantially more efficient and less critical of room placement, but still coherent over a wide listening area.))
They are NOT omni, so it must be the coherent sound over a wide listening area is why I like them.
We took our drapes down and replaced then with verticals and also took down 64 sq' of old SONEX that was falling-apart and now the room is too lively for my taste; I have to do something about that.