Hi, Jeffrey. Not to contradict you, but phase-aligned and time-correct are not the same thing.
When one refers to phase-aligned, it means that all of the drivers in a speaker are wired so they are are in positive phase or negative phase at the same time. Put more simply, all of the drivers are either moving forward (toward the listener) or back (away from the listener) at the same time.
Time-correct means that the wave front generated by each driver arrives simultaneously at the listener's ears. Time-correct speakers normally have a sloping baffle, so the tweeter and mid-range are a few inches further away from the listener's ears than the low-frequency driver. Further, to be time-correct, a speaker must have a first-order crossover (6db slope). There are very few speakers that are both phase-aligned and time-correct, such as Vandersteen, Thiel, Meadowlark, and Dunlavy (now out of business).
Single panel planar or electrostatic speakers are, by their design, always "in phase", since there is only panel, and it can only move in one direction at a time. They may not, however, be "time correct", since high frequency signals propogage faster than low frequency signals. This problem was addressed many years ago by Quad, which designed a concentric area in the middle of the speaker panel that created a radiating wave pattern from the center to the sides of the speaker panel, thereby reducing the tendency for the speaker to "beam" (have a small "sweet spot").
Hope this helps to clarify matters.
