WAlan, but I am trying to understand what constitutes a speaker designed for corner placement?
Corner placement tends to enhance bass. That’s the only thing I can think of. So the speaker is designed to sound right with that corner bass boost and may be bass shy otherwise.
If so, any speaker that is shy on bass otherwise might benefit from corner placement.
The downside I can identify and hear with corner placement in general is sound stage depth.
Yes, I remember reading that about the AN cabinets. Definitely a unique feature. Tonian is another brand I recall that designs cabinets that way.
Not sure cabinets that flex have anything to do with corner placement being best though.