These loudspeakers provide point-source dispersion for accurate stereo reproduction. They also try to cover the major frequency span of human voice and common musical instruments without a crossover to another driver. Crossover networks can corrupt the sound at important regions where the ear is most sensitive. The website also covers wide-range driver loudspeakers, those that try to cover most of the frequency span and only rely on a second driver at the extremes usually either a supertweeter or a subwoofer. Horn loudspeakers are also covered as some horn solutions help full-range drivers and others attempt to cover the full frequency spectrum with one or more drivers.
Horns are also excellent with single ended triode amplifiers.
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