re: the Volti speakers, Dick Olsher says " It’s hard to imagine a better two octaves spanning the range from 150 to 600Hz."
This relates, I'm guessing , to the range covered by the 15" bass/mid driver and its enclosure, so I wonder what that driver is and I'm curious about the box design - it looks like a mid bass "W" horn. It's hard to imagine such quality being ascribed to a driver whose surface is not facing you and firing into a very rough horn shape—but you can't argue with success!
Congratulations, Volti!