My ideal config that would slot below the Summit would be:
Summit panel on hybrid box with single 10” driver optimized for 60Hz to 300Hz range.
Modular crossover that can be field replaced with choices of basic passive with bi-amp options, a ‘no crossover’ module requiring external bi-amp and crossover, along with an option for a factory supplied ‘speaker processor’ based on a DEQX or Audyssey platform.
So you’d have the following tiers of models:
Basic system, no crossover (assumes external procs and crossovers, requires bi-amp). ~$7K
Basic passive system, optionally bi-ampable (via switch). $8K
Full active system with external processor (requires bi-amping) $10K
All of the above assume (or require) a subwoofer setup (which most people do use these days). Why pay for infrasonic performance if the lows are getting redirected to a sub anyway?
This would put the cost of a fully functioning stereo set (including a $3K sub) at close to $10K. Not much less than a Summit, but less than a Summit + sub.
A full out active system would only be $13K, not much more than Summit.
With easy bi-amp support in every version, it should be easy to get excellent performance as well.
The active versions would really be awesome, as the built-in room correctors could adjust all the delays and EQ’s to perfection with little user know-how. Just read reviews of NHT’s DEQX based speaker solution for examples of how people react to the power of that config.