The speakers appear to be 8 ohm 90 dB from a stereophile review. They dip to 3.2 ohms, which isn’t bad. The amps would drive them with no trouble in any reasonable sized room. I cannot comment on pricing until Spatial Audio figures out all of their costs. I would expect $15,000 - 20,000 per pair with premium tubes, but that might be off a bit. There will be an announcement after the Seattle show in the spatial audio lab website once it is all figured out.
I don’t know Don’s power supply design, although with Lynn’s collaboration, I’m sure some sort of split supply has been implemented - whether via isolation or regulation. It’s one area Don and I haven’t discussed.
Lynn’s original Karna concept (which I’m employing in my NiWatts) runs a separate separate B+ supply for the output section. We’ve already discussed how the sound of a 300B is the sound of the driver.
With a dedicated power supply to run the input and driver sections (separate power transformers and supply circuitry in the NiWatts - 4 transformers in total per channel), an inefficient speaker may whip the output tube’s power supply into submission, while the input and driver stages are just coasting along.
The perceived effect is that of much more power than the specs would lead you to expect.
Lynn was at a session where I drove a pair of Von Schweikerts with my puny, single-ended NiWatts. Until things got rock concert loud (I put in my musicians’ ear plugs - these guys were nuts), the NiWatts were breezing along.
... Thom @ Galibier