The term “horn” has several meanings, so it is a bit tricky determining what is a horn system. Some drivers may have a wave guide in front of the driver cone or dome and that may qualify as a “horn” to some people but not to others. I tend to think that a horn system as having compression drivers plus a long throat and a waveguide. Others will look at the cabinet the speaker is in, and if it has a long folded channel for the backwave that increases in cross section to a large opening, that makes the driver a back-loaded horn. Rethm speakers, like Charney speakers are back-loaded horns. The large, single full or wide range drivers, like those in the Rethm and Charney and Cube Audio speakers, have wave guides coming off the center part of the drivers which, depending on one’s definition, can also be considered “horns” (those smaller cones are also intended to vibrate so they do much mor than act as wave guides).
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