Coaxials - Reality vs. Experience?

Definitely, nobody is claiming coax or DC to be a perfect scheme, and in particular Tannoys do not look good in measurements. Fortunately I enjoy music, not measurements!

The Tannoys with a 15" DC (like my Canterbury) are probably pushing that woofer a bit far, asking it to do 1,100 Hz at crossover. They are technically "beaming" at that point but the dispersion of the horn tweeter helps cover for it, somewhat. Within Tannoy fandom you’ll find fans specifically of certain driver sizes, or of the tulip vs. pepperpot wave guides. I love both the 10" and 15", and both in tulip and pepperpot, but they certainly do different things. For some reason I haven’t been enamored by a 12" DC yet; you’d think that would be the good compromise.

As far as Tannoy tulip vs. pepperpot waveguide: pepperpot (usually paired with a single alnico magnet which is VERY expensive) is capable of a more vibrant, lifelike and gorgeous midrange with very fast transients and "startle" factor, but on the flipside its top end can get a bit rough and requires careful system matching to keep this in check! Tulip (dual barium ferrite magnets - this makes the drivers MUCH cheaper) is more even keeled and a great all-around performer, but can’t quite get the midrange exactly as lovely as a good pepperpot.

@mulveling

As far as Tannoy tulip vs. pepperpot waveguide: pepperpot (usually paired with a single alnico magnet which is VERY expensive) is capable of a more vibrant, lifelike and gorgeous midrange with very fast transients and "startle" factor, but on the flipside its top end can get a bit rough and requires careful system matching to keep this in check!

Agreed.

The occasionally sharp treble sting of my Tannoy Berkeley’s was reduced by 2 things.

The first was the use of isolation under the 4 feet, especially the front pair which carried most of the speaker’s considerable weight.

And secondly by gently loosening the 4 drive unit bolts to hand tightness.

Otherwise, I don’t know if even all of their alnico midrange glory would have been enough for me to stay with them for so long.

I've owned coax speakers (Thiel) and listened to a number of others - e.g KEF, Tannoy, more recently the SourcePoint 10s.

I have not found any particular advantage just due to a speaker using a coax design.  I don't for instance find the KEF, Tannoys or SP10s "extra coherent" or casting a soundstage unlike I can find elsewhere.  In fact I've found a number of speakers, even the old Shun Mook Bella Voce (Shun Mook!!!) speakers to strike me as more coherent than for instance the Tannoys or SP10s or even the KEFs.

That said...I have found the two most recent Thiel speakers I've owned - Jim's last flagship 3.7 and also the 2.7s - to be just about the most coherent multi-driver speakers I've ever heard.  Especially the 3.7.

I had the Thiel CS6 at my place years ago which had their then-new coax midrange/tweeter.   That speaker sounded very coherent with the exception of a slight change in character with listener position, especially vertically a bit as I remember.  I think some form of interference was producing a slight "hollow" sound from certain positions.

It seems that Thiel finally nailed the coax design with his last version - the tweeter set in the "flat" (corrugated) midrange driver.   That speaker's midrange and treble (and bass) was just totally coherent in my home.  Same with the 2.7.  I can not for the life of me "hear out" the difference in drivers, any transition, cancellation or anything.   And it maintains it's character over a very wide area.  The sound is very consistent even when I stand up and walk around the room.

The other thing with the Thiels is the insane imaging prowess.  There is a focus and precision and density to the imaging I have rarely heard before.  Even my Joseph Speakers, renowned for imaging, sound slightly diffuse and less tight when directly compared with the Thiels.

So ultimately I have no idea how much of this to attribute to the fact it's a coax driver for the mids/highs, or to the first order/phase coherent design, or to any number of other design choices in the Thiels.

@prof Prof    100%           it is impossible to hear difference between tweeter location in the center of main driver or couple inches from . This is placebo efffect or good marketing point.LOl, Is it also applicable only  to 2 way speakers , but a lot audiophile disagree, Keep Enjoy 

@prof Prof    100%           it is impossible to hear difference between tweeter location in the center of main driver or couple inches from . This is placebo efffect or good marketing point.LOl

Sure just get a cardboard box and throw a few drivers in there, place them wherever really, what does any of that matter? 😂