I recently purchased a pair of Gamut R7Si and am driving them with a pair of Jadis JA30Mkll amps. with the Gamut D3i preamp. This is a pretty heavenly combo as long as you don't want to wake the neighborhood.
I have owned compression driver horns for the past 12 years and this is the first dynamic driver box speaker I liked as much with the life of the Edgarhorns. The Gamuts go down to 22Hz with authority and are very honest to the source. A lot of credit goes to the cabinet's 21 layers of wood keeping the speaker alive.