The Shure V15 V with a Jico SAS/B stylus VS The Soundsmith Hyperion MR and Lyra Atlas SL

@dogberry It is the timing of the reflections that is important, early reflections being the worst. Late reflections dictate the sound of the room. Early reflections should be eliminated as much as is possible. The best way to do this is with speakers that do not send sound in the wrong directions. Eliminating early reflections improves image specificity. 

@lewm I am not looking for a flat response. I am looking for a specific response which is far from being flat. I measure everything at the listening position. The microphone is comfortable at 85 dB.  Sine wave sweeps on a CD are used in conjunction with a computer program. The channels are measured independently and adjusted so that their response is as close to identical as possible. 

You are always welcome Lew. Anytime you are on your way up or back. 

Dear @mijostyn :I listened the Triolon Excalibur in a home system in Houston and as you posted the Acapella are something to listen it yes very expensive:

Dear @bdp24   : As you low coloration is too apririty for  me but even live MUSIC has natural colorations and it can't avoid it.

But that was not my point why I posted about " horns " ( and there are horns and horns not all are Klpish or the like ) but something that is near to the Live MUSIC:

Immediacy and things are that horn has it as no other type of speaker driver. Colorations culprit ( if any ) comes by manufacturer design. Audio is not perfect but you needs to have the Acapella experience.

R.

@mijostyn 

"Do you realize that you have just noted that every great speaker designer is absurd, that the laws of acoustics are flawed. Don't listen to me. Get The Loudspeaker Handbook by John Eargle. It is written in terms most lay people can understand. Learn what you are talking about before you spew out ridiculous concepts. The British don't like music? I think you need to listen to V.W.'s The Lark Ascending"

Sir Thomas Beecham is a far greater authority than me, and I suspect, even you!  It was his quote.  If it were mine, I might substitute audiophile for British!

I have many copies of The Lark Ascending, and one of my favourite flicks is the Australian "The Year My Voice Broke" which uses it poignantly, and has just been reissued.  Vaughan Williams could write almost anything, from his Fantasy on a Theme of Thomas Tallis to his sixth symphony, which is exactly my age.  The latter opens with shattering intensity, swerves into jazz rhythms, and ends like Holtz' The Planets.

I note with some disappointment that you choose to criticise the person, rather than debate the specific technical points I raised.  For example, what is your answer to the complete cancellation of two drivers half a wavelength apart, which you claim act as one drive?  This is pure physics, simple to understand by anybody who knows what a sine wave is.

Of course, this really is a problem with almost all speaker designs, so not too many want to talk about it.

Not a problem with a single full range driver.