Sonus Faber Stradivari. A three-way design in a unique elliptical enclosure featuring 2pi radiation and a symbiotic tuning system. Each driver is loaded into a tunable cavity, open in the case of the midrange and low frequency drive units, sealed for the high frequency unit. The crossover employed has been developed not only for purity of transition but specifically for enhancing the performance of the amplifier/loudspeaker interface. USD 45,000.