Hi Mapman,
I have the Cain & Cain double horn IM-Bens, essentially two of those single-Bens stacked together upside down.(if that makes sense)
I have also listened to single Bens. Beautifully made, that's for sure. And the sound, with proper upstream components, is amazing.
But, once again, these are speakers ideally designed to be matched with tubes. Especially low-power(<24 wpc) single-ended triode(SET) amps. To get the best out of them, you'd have to be willing to use something other than your beloved Carver and MF.