It seems the hiddeness is big on their list. But how is coverage and quality of the sound addressed?
What I mean is, I'd think the sound is mainly on-axis directly below it and spread (diffused and reflected) or absorbed by the flooring material that's also directly below it.
Also, I see various sizes in diameter. Are these intended to help the quality? If so, what's the typical/recommended minimum for a typical HT/audio set up? How do people avoid "blasting" the listener seated below/slightly off-axis?
Thanks!