The RAAL 140-15D has deflector pads that forces the dispersion of the ribbon to behave as a spherical point source rather than a line source. So this may help with integration with cone drivers, if your claim about dispersion characteristic is true.
Anyway, differences in dispersion characteristics can't be the only reason why I hear discontinuity. The Maggie ribbon tweeter and older planar magnetic midrange/bass are both line sources with similar dispersion pattern, but there is an obvious discontinuity between them. The planar magnetic doesn't have the low level resolution and speed of the ribbon and you can hear it. Yet, the lower end Maggies without the true ribbon tweeter doesn't suffer from integration issues. You can try to mate a long ribbon tweeter with multiple cone drivers in a line array so dispersion is similar, but IME this approach really doesn't solve problem either. A ribbon tweeter or electrostat can reproduce a square wave pretty accurately, but try doing that with a midrange cone driver, which is usually plagued by slow rise and settling time and ringing. I'm no speaker designer so some of my observation and knowledge may be wrong, so please correct me if I'm speaking out of my arse.
One of the virtues of the Sasons is their seamless integration, similar to coherence of "full range" single driver speaker without the high freq irregularity and low end roll off of single driver speakers.
Anyway, differences in dispersion characteristics can't be the only reason why I hear discontinuity. The Maggie ribbon tweeter and older planar magnetic midrange/bass are both line sources with similar dispersion pattern, but there is an obvious discontinuity between them. The planar magnetic doesn't have the low level resolution and speed of the ribbon and you can hear it. Yet, the lower end Maggies without the true ribbon tweeter doesn't suffer from integration issues. You can try to mate a long ribbon tweeter with multiple cone drivers in a line array so dispersion is similar, but IME this approach really doesn't solve problem either. A ribbon tweeter or electrostat can reproduce a square wave pretty accurately, but try doing that with a midrange cone driver, which is usually plagued by slow rise and settling time and ringing. I'm no speaker designer so some of my observation and knowledge may be wrong, so please correct me if I'm speaking out of my arse.
One of the virtues of the Sasons is their seamless integration, similar to coherence of "full range" single driver speaker without the high freq irregularity and low end roll off of single driver speakers.