All this talk of high end 10 and 20 thousand dollar speakers , backed up with this sub or that sub, maybe you should be looking back instead of forward.
There are plenty of great vintage speakers out there that will sit you back a fraction of what is being discussed here and do an excellent job.
For a really great speaker, that's off the radar find a pair of Time Frame 600's, very nice speakers and they have the small drivers.
Find a pair of used Bozak 4000 b symphony's, super speakers.
I am a big Altec fan and nothing moves air like a 15 inch driver topped with a nice Horn on for the mids.
I build my own speakers now, I have a pair of Altec model 19's I built of my own design, using GPA 416 drivers , GPA model 19 crossovers and original 811 horns with 802 drivers.
They have super clean , fast bass and will make you think an orchestra is in the same room with you.
They will literally shake my 3600 sq. ft. ranch home with clean low end bass and clean mids, no need for subs.
They did not cost 10's of thousands of dollars and did not need to be built in some super fancy boutique speaker shop.
Simple designs with good quality components and yes Great Plains Audio is the Altec of old, just a name change.
I would put these speakers up against any 25000.00 speaker and not flinch, the finish would not be as nice but I don't look at them, I listen to them.
Well maybe I do hug them once in a while, they are over five foot tall and 32 inches wide.