This block diagram illustrates the steps involved in the process of designing a loudspeaker system. In general of course, there are variants of this process, depending on the specific context at hand, the tools used, and the design philosophy, but these variants are more similar than they are different.

Here are the most significant aspects about the process that deserve attention:

1. We measure S_d, the effective driver diameter, indirectly rather than directly, from measurements of V_as and M_ms.
2. The [free-air] SPL and impedance curves of the drivers provided by the manufacturer are used for validating and refining the driver model we create in LEAP.
3. Thiele-Small parameters alone are not good enough for designing in the real world. The more sophisticated driver models such as those of Vanderkooy and Wright take into account factors such as the frequency-dependence of voice coil inductance using additional parameters that go beyond the original Thiele-Small parameters. LEAP goes still further in model complexity, and is able to model drivers at large signal levels too.
4. The dotted items show the "ideal" crossover design process. However, with the better driver models we spoke about above, the SPL and impedance behavior of the mounted drivers can be simulated very accurately, in many cases reducing the need for actually building an enclosure prototype for the purpose of crossover design.