Speaker Designer calculates frequency responses for Closed, Vented, Sealed Compound (isobaric), Vented Compound, PushPull, 4th and 6th bandpass enclosures, excursion plot, power response, crossover calculations, Zobel Network, Series Notch Filter, Parallel Notch Filter, L-Pad, calculate port length and it can calculate optimum configurations for almost every enclosure!