In my time, I have reviewed some monstrous speakers. Whether this is as a result of my golden ears, or because I am big and ugly and can unpack big sound boxes, is moot.
Some of the largest and most luxurious have been bipoles. This is when, seemingly just for the hell of it, a whole other set of speaker drivers are placed on the face of the speaker enclosure that is looking the opposite way. Mirage and Definitive technology are probably the two most famous brands that typically make big speakers in this fashion.