Have you been following what I said I do? Speakers for professional applications? Do you think that just means studio speakers? @donavabdear mixes for movies where you are trying to "recreate" real dynamic events.
20CuFt is not really enough for a proper horn loading at 20Hz.
Tell me @phusis, what is your personal definition of "dynamics"?
What is a sufficient peak db level?
What is a peak db level listening to an orchestra say 10 rows from the stage?
How often are you trying to recreate a Saturn V launch?