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Questions for JA on the "sound" of truly "time-aligned" speakers with perfect step response

Posted by Brian H P (A) on September 19, 2017 at 11:12:51

Hi John:

Over the years you have tested several speakers which displayed a near-perfect right-triangle step response on the design axis. Most of the older ones (Vandersteen, Dunlavy, Thiel, Meadowlark come to mind) achieved this effect through the use of stepped/slanted baffles and first order acoustic crossovers. More recently, the Dynaudio Focus 200 and Kii Three powered speakers have achieved the same effect through digital delay of the highpass via DSP crossovers. (Interestingly, I haven't seen any coaxial drivers, KEF or whoever, exhibit such perfect time alignment).

So I'm wondering, have you in your listening detected any characteristic sonic quality associated only with such designs, that distinguishes them from conventional non-time aligned speakers? A more "coherent" presentation, such as their designers claim?

Also, do you find the vertical listening axis yielding the flattest response to be narrower than, or about the same as with conventional designs?

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