Eldartford, cheesy horns do have resonances, the way many other speaker technologies do. A good horn has less resonance than the your speakers do though. Don't misunderstand me here, I totally empathize with people that have trouble understanding this last point!
As you point out, sound radiates as a spherical wavefront, no doubt why Quad made the ESL63 a semi-spherical device.
A horn often uses a diaphragm that has a similar semi-spherical shape, only it is much larger when it emerges from the mouth of the horn. This may explain why so many people, on hearing good horns, comment that they sound like the best planars, only with greater dynamic impact.
IOW my experience of horns is that planars are really the only thing that compete with horns for naturalness of timbre, coherence and detail- cones don't seem to keep up.
So I rate horns first if they work right (last if they don't), planars second in the firmament and cone systems last.
As you point out, sound radiates as a spherical wavefront, no doubt why Quad made the ESL63 a semi-spherical device.
A horn often uses a diaphragm that has a similar semi-spherical shape, only it is much larger when it emerges from the mouth of the horn. This may explain why so many people, on hearing good horns, comment that they sound like the best planars, only with greater dynamic impact.
IOW my experience of horns is that planars are really the only thing that compete with horns for naturalness of timbre, coherence and detail- cones don't seem to keep up.
So I rate horns first if they work right (last if they don't), planars second in the firmament and cone systems last.

