Single driver vs traditional 3 way loudspeakers

A huge system from Russia - AER driver with big AER transparent horn + 2 x 4 x 15inch bass drivers.
Start listen from 1:12
https://www.youtube.com/watch?v=WF_ZeYVgAf4&t=4913s

Most of full range drivers have incline frequency response. And with a backloaded horn implementation they have a dip in lower midrange that causes dry and bright sound. To compensate it front horn should be added.
A good example is AER big transparent horn.

I don't have experience for adding super tweeters to full range. But with compression driver horns - 4th order crossover works 1000 times better vs 1st order crossover!!! Much less high midrange distortion, sound smoother more detailed, bigger and deeper soundstage, better clarity and separation. You can follow over interpretation more easy and enjoy music. I always used forward firing super tweeter and I did alignment for both 1st and 4rd order crossover implementations.

Correct, i can say most of full range drivers got dip in lower mid ----upper base 150-300 Hz that causes tiny sound .

The db/fq chart does have some value.
I know/ can understand  that a chart with too many peaks/dips and the size of each dip/peak, does equate to either superior sound or equates to midrange stress aka distortion, coloration, = aka The Dreaded Mionster n who goes by the name Monster Fatigue.

The davidlouis W4 has a very nice clean relatively smooth chart, vs the Dayton W3 from parts Express
DavidLouis W4 @ $175/pr
vs
DaytonW3 @ $60/pr.

Here is the Tang Band W3 1878 chart.
Nearly identical to the DavidLouis W4., except the DL W4 has big roll off on highs.
I can just tell from looking at this chart this speaker sounds super fidelity.
Which is why TB has it priced correctly. $130/each.
Their W4 with special PP fetches $230 EACH!!!
TB1878 chart.
No roll off past 20khz!!! that entire chart looks gorgeous.



The thing is hitting 60hz’s @ 80db,, UNREALLLL


http://www.tb-speaker.com/products/w3-1878

ok just found the chart for the DavidLouis W4. Might be back in stock, not sure
anywayy
db/fq chart shows very poor behavior. Dips and peaks all over and has the highs extended past 20khz.
In my ststem the highs seem rolled off at 12khz,, 
So this proves charts are not not that helpful/
With a  chart like this, I would believe the speaker  has stressed/distorted mids. 
Which it does not.
 Mids have no stress, clean, clear and good bass,  at 80hz shows 85db = valid, not hyped. 
I have no idea which is the superior speaker
DLW4 Nd
or
TBW31878 Nd (pill type magnet)

Both  will have a  home in my system.

https://www.aliexpress.com/i/32808654531.html