NetDesignerPL is loudspeaker network design application.
First, Second, Third and Fourth order network of 2way and 3way can be designed.
NetDesignerPL is a pilot version freeware.

The shoulder characteristics of Linkwitz - Riley, Butterworth, Butterworth - Asymmetry, Bessel and Chebychev can be chosen.
Various impedance correction and level matching are calculated automatically.
NetDesignerPL is made based on the papers by Siegfried H. Linkwitz , Robert M. Bullock III. and others.
Capture of a window screen.
Careful points :
Element values of capacitor and inductor can't be customized.
Because the direct current resistance value of inductor isn't being considered,
An error of the level by the band of the network made actually forms.
Addition :
Use of "PAD_Corrector.app" of an utility can correct a band level error.