If you're looking to make a visual statement with your speakers, the Pnoe Horns from Arcadian Audio should definitely be on your short list. Arcadian claims the Pnoe Horns are the culmination of a 10 year effort to design and realise a horn speaker without compromises. The enclosure
is made from a fiberglass sandwhich construction, with materials added to control resonance. The very unique shape completely eliminates standing waves.
The single full-range driver is an AER MD3B, which produces a frequency response of 42Hz - 21kHz with 100dB/W/m sensitivity.