Originally Posted by Alimentall
I NHT and others have found that the steeper crossovers fix more subjective and objective problems than they create.
NHT may have concluded that - but that is NOT the conclusion of Keith Howard and
Leo Spiegel, the chief designer for the original Apogee speakers:http://www.apogeespeakers.com/leo_spiegel_interview.htm
Leo Spiegel states that they tried steep crossovers when designing the Apogee Stage;
and found that the drivers in this two-way unit didn't integrate. He stated that when
steep crossovers were employed, one could hear the two drivers distinctly instead of
the desired effect of having a seemless whole.
Leo Spiegel used a lower order, more gradual crossover to "blend" the output of the
drivers over the crossover range.
Theoretically, one would expect a more seamless transition in such an approach. If
you suddenly switch from a large driver to a smaller driver - which is what a steep
crossover does - for nearly the same frequency; you shift from one size "antenna"
[driver] to another. You have a sudden shift in radiation pattern - the larger driver
has a narrower dispersion since it is closer to the beaming limit, where as the small
driver is more isotropic.
The only problem the steep crossover really solves is the designer's problem of doing
what Leo Spiegel does and blend the driver output in the crossover regime. The steep
crossover decouples the crossover problem and makes the DESIGNER's job easier
by not having to blend together the output of two drivers as does Spiegel.
However, the price of making the designer's life easier is paid by the end user in a
poorer quality listening experience.