Woofer-Assisted Wide Band

Having owned and heard 2 of the worlds finest ever made tweeters
Seas Millennium
Seas Crescendo
and the worlds finest ever made midwoofer
Seas EXCEL W18E001
Based on this experience, I look at tweeters, midwoofers as ~~nothing more~~~ than helpers, supporters, offering augmentation for the wonder-full, incredible, fantastic, stunning ~~wide bands. 
That is to say, non-wide band drivers, really dont interest me in the least.
Thats is to say, I'd never buy a  Wilson, nor a  Vandersteen.
To me ears they all sound the same, fatiguing, when pushed to their limits. 

Listen to female vocals at 
5:45
Your speakers cant do that. Neither Wilsons nor Vandersteens can reproduce vocals as my speaker can

and this is YT compressed,  via your $20 computer speakers!!!!
Sounds exactly like the Seas Millennium's,  and Philips 1980's clear dome tweet, but ona  factor of 10 X's superior. 

Why?
Much higher sensitivity.

5:45

https://www.youtube.com/watch?v=57JLhOnjqck

@mozartfan, this time I am left speechless. I bet you like wine no?
In my own universe music is music. Does not matter the genre. The system's settings remain the same. A system that is excellent with Punk is going to be excellent with everything else. I am dead sure that your definition of "excellent" is different than mine. But, I suppose that is why Howard Johnson made 28 flavors. We all know that the only true ice cream is Vanilla. Everything else is just vanilla with a lot of distortion.
Being a DIY kind of person I make my own.

Here ya go
Have not heard even 1 speaker in this list. Dont care to.
There may be some things I ~~mighyt~~ like about these 25,, then again,,there may be issues..
~~extra baggage~~, 
Its been my 40 yr goal to avoid all ~~extra baggage~. allowing only the purity of the music to be ~~en-joy`ed.
I am sure some of these do some very wonderful things.
But at what cost??
Sorry not interested = Not my cup of teaS

THe Seas Thors do some nice things with music,, But sadly, at 87db, sens, its like music from behind closed doors , when placed next to a wide band. 
AS they say, no speaker is perfect, there are ~~compromises~~
WEll with my wide band as ~~front/center~~, this is IMHO the least  compromises of any design..
For classical music.

Midwoofers are attempting to carry the critical 500hz-1500hz. 
Sorry not acceptable.
Crossing at the critical 1500hz-2khz ,, now we really have a  mess, with the tweeter attempting to voice again critical 1500hz-4khz.
I've not heard the AER in person, so I can't say how this popular wide band performs. 
Maybe one day I will attend the Tampa Audio Fest, and get to hear it.
But honestly I have zero interest in the AER's. 
Just look at the horn cabinet's for these drivers.
Ridiculous. 
Repeating above
I have zero interest in any of these speakers on the list, and have no interest whatsoever in any other TRoel Gravesen speaker, who I feel makes the finest speakers.

My intent is to cofirm what Erik has a  hunch in the OP.
A wide band can  carry the critical range far superior to any other type design. 
I made my experiements, and concur the OP is spot on ~~the real deal~~

https://audiophilereview.com/audiophile/the-25-ultimate-audiophile-speakers-of-all-time/

Mozart ; your use of we suggests you had a date with Einstein ….

Not sure when you got a jones for Vandersteen but if you and your creation make it up to Seattle, we ( as in you, me and ? ) can listen to the clash, cosmic hippo and of course your namesake on the world acclaimed model 7. IF you desire more neutral ground, haul them to Munich.

of course, we can use the venerable ESL-63, Apogee Stage, Thiel 2.3+, even my hot rod Dynaco A-25…..

I am betting your driver pukes on Cosmic Hippo…

carry on