If you are talking about wire stator ESLs such as those built by CharlieM and others, the frequencies are not so much divided by wire group as they are progressively changed. A center section or segment of wires gets full bandwidth signal. As you move along from segment to segment the HF(High Frequencies) are progressively rolled off more and more. This equalizes the naturally rising response of ESLs, and has the nice benefit of improving dispersion.Sorry for the trivial question.
I don't quite understand how the frequencies in a wire stator are divided.