San Diego-based retailer SimpliFi Audio was showing the Gradient Revolution Active loudspeaker ($11,995/pair) with the Gradient Revolution SW-D dipole subwoofer ($6995/pair), much to the chagrin of their neighbors, especially when playing organ music into the nether regions at I-think-I'm-going-to-be-sick levels. Also in use was a pair of the DSPeaker Anti-Mode 8033G ($595/each one per subwoofer) a digital room-correction device, "the cure for boomy bass." From what I heard, it works.
When I was in the room, SimpliFi was showing the Gradients with a "$500 Fosgate amplifier" and DNM $12/ft speaker wire to show that you don't need to be spendy to get flat response to 20Hz. The RA Opus 21 CDP/DAC/preamp ($3500) was being fed its music files from a laptop.