Single driver vs traditional 3 way loudspeakers

Hi @mozartfan ,
High-Pass filter and crossover are the same thing!
You didn't read my message. I told that 4th order crossover (HF filter) fixes most issues with super tweeter.
I have to add that in case of forward-firing super tweeter placement should be aligned with the speakers. It is true for any kind and order of crossover (HF filter).
Regards,
Alex.

The comment about all 3 way speakers being fatiguing in the long run is an incorrect generalization. I have lived with 3 ways that did betray their crossover points in use, but I also owned the Spendor SP100, and it was not the case with that speaker.

Hello @alexberger , also is very hard to add super tweeter to whizzer cone wide band drives, ih this case we have two tweeters - one mechanical -whizzer and other one electrical, we have to say by by one’
i say by by to whizzer tweeter and cut it down, I know some guys do it same and say whizzerectomia , may be wrong spelling

Hi @bache ,

Thank you for explanation.
I understand if you use full range driver you don't want to use it thought LPF.
With most of compression driver - midrange horn combinations high frequency response drops relatively fast and without significant peaks. So it is possible to separate frequency ranges between midrange driver and super tweeter if using 3-4th order HPF for super tweeter and don't need LPF for midrange.
     
I have a friend who is DIY speakers builder with many years of experience. When he built a number of JBL 4344 clones he always use 3-4th order HPF for super tweeter.
He told me to use 3-4th order when I bought Fostex T90a. But I didn't listen him in beginning.
And I now understand how right he was.

Regards,
Alex

The comment about all 3 way speakers being fatiguing in the long run is an incorrect generalization

~~~~~~~~~~~~~~~~~
Yes this is true. 
What I mean by ~~fatiguing~~~ is certain fq's in the higher bass hz and the lower midrange fq;s, are **colored/barky/muddy/boomy *etc etc. 
Usually , in fact all this is comming from the midwoofers above say,,,200hz range through,,whereever the midwoofer ends its singing part in the speaker design, usually at 1800hz-2200hz. 
I really have no issues with tweeters other than they are extremely inefficient and thus the music sounds like a  wet blanket has been thrown over the speaker. 
Thus midwoofer (other than my Seas Magnesium) all are some paper type comp, Accuton has ceramin, might be OK, but those mids are wayyyyy over priced.
So basic midwoofer has terrible time in the 200hz-2k hz range.
This is where all the grateing on my nerves comes from. 
Now again,  I know of 2 tech geeks who adore  their stacked paper cone speakers from the 1970's, So each his own.
I could not live those paper things, Totally grate my nerves.
I need/demand  pure neutrality with zero coloration.
This is how  WBers voice, pure clean music.
No coloration, zero fatigue. 

This is what i mean about fatigue. 
Again you might find your speaker perfectly ok.
But for some we  are looking for neutrality, no coloration from the midwoofers. And tweeters won't work for us WBer cultists.