Thanks for bringing up those points, but I have an engineering background, so I’m well aware. By "switcher," I was referring to placing a higher-end analog preamp in front of the Devialet, primarly to handle (or "switch") my analog sources, since a Devialet would have only one analog input in my system. The pre-amp might, e.g., be something like a Benchmark or Pass Labs. Since the Devialet digitizes all analog signals, and since any line-level analog input will have to be amplified at some point in the pre-Devialet signal path, I’m not concerned about degradation when we’re talking about a context like this. Hardly "goofy."
As for running the speakers in parallel, jeez, of course, I’d be using my sub’s high-impedance input, orders of magnitude higher than that of my loudspeakers.
The bigger issue with running two sets of speakers from the Devialet’s single set of amplified outputs is that both speakers will be playing signals that have been processed by Devialet’s SAM function. That may extend my Harbeth’s low end down an octave (I wish, but maybe) but would also alter the phase and EQ of the signal sent to my sub. What makes this a credible solution is the fact that my sub incorporates DSP-based room-correction, which Devialet believes would handle a SAM-enhanced signal as easily as one that was not. And who knows, the sub might even sound better with the Devialet’s bottom-boosted, phase-compensated output as a starting point!
But don’t get me wrong. I’m still not married to Devialet. It would be nicer, as you imply, to have a less-complicated, maybe less-expensive, one-box solution from the likes of Ayre or Hegel.
Working on my spreadsheet tonight, and what'll pop out when I can review the numbers on one page, I have no idea.