green mountains

Bombaywalla,
That was one of the best responses I've ever read here at Agon. Very well said and with good info.
Just one error though.......
Meadowlark and Thiel ARE time and phase coherent speakers.
JMLab definitely not. Only a couple Dynaudios are capable of being, and only then IF set-up very strictly speaking.
Either way. The Meadowlarks and Thiels are the one that were designed to be phase coherent.

Prdprez, thank you for your kind words.

03-28-12: Prdprez
...........
Just one error though.......
Meadowlark and Thiel ARE time and phase coherent speakers.
........

yeah, I know that Thiel does advertise that their speakers are phase coherent but I do not believe that to be true hence my statement the way it was written.
Here is some proof to back up why I do not think that Thiels are phase coherent:

http://www.stereophile.com/content/thiel-cs6-loudspeaker-measurements
This is for a Thiel CS6 speaker. Look at Fig 1 which shows the impedance & phase plots. The phase is all over the place going from -45 deg at 45Hz to +22.5 deg at 20KHz & every phase angle in between. IMHO this is hardly phase coherent!

http://www.stereophile.com/content/thiel-cs24-loudspeaker-measurements
This is for a more recent Thiel CS2.4 speaker with the review done in late 2005. Again, look at Fig 1 which shows the impedance & phase plots. It's worse the older CS6 speaker as there's even more phase shift in the 20Hz-20KHz audio band!! Once again, hardly phase coherent; au contraire, it's quite phase incoherent.

In comparison, look at the impedance & phase plots in Fig 1 of an older Green Mountain Audio speaker - the Diamante. This review was done in 1998. Look how flat the phase response is in the 200Hz - 20KHz range. Very nice indeed! Now, this sort of speaker is distorting the phase minimal hence far, far more phase coherent. There is a dip in the phase to -30deg at 70Hz due to the bass enclosure (the bottom rectangular box).
http://www.stereophile.com/content/green-mountain-audio-diamante-loudspeaker-measurements

GMA has a white-paper on its web site concerning time allignment and phase coherance and the relationship between the two. About half way into it, they make the point that time coherance is the condition for phase coherance-- not the other way around as mentioned above.

http://www.greenmountainaudio.com/time-and-phase-coherence/

I recently had a two-week audition of the Eos-HX monitor. The HX reportedly reduces phase shift to +/- 1 degree across a wider frequency range than with prior Eos iterations. I liked these speakers very much-- particularly good value at their $4K MSRP.

Bombaywalla, perhaps I'm the one that's mistaken, but I think you might be confusing electrical phase for mechanical phase?

Thiel's previous products before the use of concentric drivers had different plots, e.g.:

http://www.stereophile.com/content/thiel-cs2-2-loudspeaker-measurements

http://www.stereophile.com/content/thiel-cs36-loudspeaker-measurements

http://www.stereophile.com/content/thiel-cs5-loudspeaker-measurements-0

BTW, for those that might not have been aware of this (IMHO, perhaps the best thread to ever appear on Audiogon):

http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1032037028&openflup&151&4#151