The JM Labs are not time and phase coherent by any stretch of the imagination! Look at the step response of the Utopia, the woofer is connected in reverse polarity to the mids and tweeter. The Wilsons are not time and phase correct either. Look at the step response from the Sophia.
They're very few speakers that are time and phase correct or even just time correct.
Even if you use a single driver, this in and of itself does not mean the speaker is time correct. You can look this up in previous threads.
Vandersteen, Thiel, Meadowlark, Green Mt. and few others pass the step response test indicating time alignment.
It is hard to design these speakers and the engineering costs are high. Why do it if you can sell non-time aligned speakers and discount time as inconsequential as reported in Stereophile. If you put the Vandersteen 3a Signature in a nice wood cabinet, it would sell for $10,000! Thiel does and look at their cost.
Time speaks of when a sound leaves a driver. If it is not a first order crossover design, then it is not going to be time aligned.
They're very few speakers that are time and phase correct or even just time correct.
Even if you use a single driver, this in and of itself does not mean the speaker is time correct. You can look this up in previous threads.
Vandersteen, Thiel, Meadowlark, Green Mt. and few others pass the step response test indicating time alignment.
It is hard to design these speakers and the engineering costs are high. Why do it if you can sell non-time aligned speakers and discount time as inconsequential as reported in Stereophile. If you put the Vandersteen 3a Signature in a nice wood cabinet, it would sell for $10,000! Thiel does and look at their cost.
Time speaks of when a sound leaves a driver. If it is not a first order crossover design, then it is not going to be time aligned.