When I heard the Volti speakers at the show he was using some $40k SET amps with a Lampizator DAC. Certainly hard to go wrong with that setup.
It's common to think that each component in a system should not be too out of line cost wise with the other components. Not always the case as with these Volti speakers. They were quite capable in utilizing top level electronics. I have a pair of B&W floor standing speakers that I bought in 1999 for my HT system. They were ok. I was curious one day and connected them to my hifi system. They didn't get any better.
The Volti speakers also have the option of external crossovers. A further refinement keeping the electronics away from sources (the speaker drivers) of vibration.