HiFi vs MidFi

Then why are you continuously defending and apologizing for them?

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Let me get back to the OP's Q.
which is
Do speakers bring down a  perfectly high fidelity amplification /source, down to **midfi*??
THe answer is yes. Wilson, Sonus Faber's, Zu's, Tektons  are only offering more bass/highs  Which is  not hifi
Our music is in the total midrange.
Here in this super critical range is where a high fidelity speakers is distinguished from  a  mid-fidlity,, Mhich term is moot, There exists only high fidelity, 
If a speaker is not high fidelity, then it is not mid fidelity.
The davidLouis yellow cone 6 is ok, but it is not high fidelity. Is it mid? Who cares,
I am only interested in high. Mid does not interest me. 
For me, all tweeters are high fidelity
But only down to 3khz. below that is all mid fidelity, Tweeters are flawed below 3k hz.
same with Magnesium cone midwoofers, Great speakers below 1800hz.
Above that they sound distorted = mid fi = garbage.
This is the entire synopsis of my arguments for WBers.
That this super duper critcal 2khz -3khz will be voiced HIGH fidelity via a high end WBer.
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xover type speakers are falwed in this  tiny in size(1khz), but HUGE in music band width.

If you want to deny this age old problem with xover speakers,, you really need to visit Troel Gravesen's web page. 
He oft mentuiions these issues, which i never quite understood til the other day.
WBers stand alone from every other speaker design.
WBers are Kings.

Look I am aware my comments will rock the audiophile world.
The issues with xovers/midwoofers is longggg overdue for exposure and yet with understanding.
The only way to high fidelity is via knowledge. Denials will only  lead to regrets.
Miles Davis cd will make any speaker seem to be high fidelity, Which is only a deception. Once we play complex swaing jazz, classical orchestra the glaring defects will be clearly heard  all due to the failure in voicing correctly this super critcal 1800hz-3200hz band width.
Ck out a  classical instrument band width chart.
This 1800hz-3200hz is like 70% of the musical imagery.
Vocals as well.
This band width has to be voiced super strong with power and authority.
This is exactly the band width where WBers excell and shine.
Basically a WBer is a  midrange driver with emblishments on bass and highs.
Thats all it is. 
Midrange speaker.
These speakers absoluetly require a  midwoofer and tweeter.
A single  wide band is going to only voice the midrange with high fidelity.
If you need bass as we all demand then add any woofer of your choice provided it voices as neutral as the bass of the WBer.
Again tweeters area  Must. 
Add in any tweeter as all tweeters have no breakup /distortion above 3khz.
Run it down to 5k hz is my recommendation. 
 8uf cap will take it down to 5khz.
I recommend Mundorf EVO Silvergold or if you have the cash SESGO. There is a  sonic nuance with the SESGO, But again those lil guys are like $250 EACH!!!!.
On midwoofers Supreme Silver Oil 10uf will take midwoofer up to say 1600hz/1800hz.
Now your WBer system has been taken to near TRUE bonifide FULL range, down to 40hz and up to the stars on the tweeter. 
If yopu want sub 40 hz, get any sub woofer ((YUCKKKYY) I HATE sub woofers.
A stand alone WBer is mid-fidelity. 
Just as a  xover type speaker is mid-fidelity w/o adding in a  high end WBer.
Both need each other. But the true Tenor/Sopranos on stage are the WBers, xover types only play a  supporting casting roles.
Note the word *Supporting** = necessary but not front and center importance.
These findings support Bache Audio's spaeker systems. Although Bache prefers super tweeters, Which I don't.
Risk of bringing in sibilance. 

Do speakers bring down a perfectly high fidelity amplification /source, down to **midfi*??

From what I have heard on your videos, Frankenstein needs to take a big step up to make it to mid-fi. So in that sense, I agree with you. Your speakers drag your system down.

These findings support Bache Audio's spaeker systems. Although Bache prefers super tweeters, Which I don't.
Risk of bringing in sibilance.

Nope, wrong again. When implemented properly, they are no different than any other tweeter. They will be less of a problem than the whizzer cones that you love.

whizzers allow for a   wider soundstage.
Rolloff? For sure, no big deal.
There are 1000 tweeters out there that can sing quite well above 5khz.
The only fq's I need from a  high end WBer are 40hz-12khz.
The 5khz-12khz from a  WBer are much greater soundstage presence vs any tweeter's 5khz-12khz.
But as for 10khz -20khz, here we absoluetly demand a  tweeter for ambience, sheen. 
Over lapping all fq's brought ina  unreal soundstage /presence to the music.
Diana Krall never sounded so good as when I brought in the DavidLouis W4 to pad up the DLVX8.
This is going further when i add in the DLVX6.
xover type speakers A-Z have this critcal band width problems at 1800hz-3200hz.
A WBers 3khz-5khz will always smash a  tweets 3khz-5khz. 
Its the nature of the beast. 
back in 2002 I asked about all speaker designs, flaws and +'s. 
No one even came close to my discussion of the obvious flaws of the xover types vs the WBer types.
Of course back then the 2 main WBers, Fostex, Lowther were not very good, not high fidelity.
Now fast forward some 20 yrs, now we have these high fidelity WBers.
Old technology born anew. 
The only commercial speaker that interests me are the Bache Audio Lab. 
Bache Audio Speakers will deliver the  finest sound in all areas. 
Outshooting Wilson, Dali, Zu, Tekton, Vandersteen, Sonus Faber, Tannoy
And all the other xover/ concentric designs. 
A-Z. 
WBers always win + midwoofer + tweeter.
Cohesive , seamless, full rich, dynamic, life like vocals, presence, lowest coloration, distortion ( these characterists all depends on which midwoofer Bache Audio employs, as I only  accept Magnesium, he employs some sort of paper, paper has some unwanted resonances)

Nope, wrong again. When implemented properly, they are no different than any other

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Its a  known fact super tweeters/horn tweets have sibilance.
I HATE super T's.  The highs stick out like a  sore thumb. 
I believe the BA super tweet is some sort of Fostex and is basically a  compression horn.
= No go.
I prefer dome. Or my paper cone tweeter. 
Classical music does not need the 15khz=50khz  super tweet range.