3-Way APC Crossover Designer / Calculator Help

  Crossovers are used to filter frequencies from a driver. A High Pass Filter (HPF) filters low frequencies and a Low Pass Filter (LPF) filters out high frequencies. Crossovers are necessary to prevent overlap in frequency responce from different drivers in a system, and to prevent a driver from producing frequencies it was not designed for.

  You should be aware that crossovers can produce phase shift problems. When 2 drivers are out of phase, they will be moving in opposite directions at the same time. Each 3-way APC crossover is labeled as reverse or normal polarity for the bandpass speaker. For the reverse polarity crossover, the + and - connections on the midrange ( bandpass ) speaker are reversed. This occurs for both 2nd order crossovers, and 2 of the 3rd order crossovers. The reversing in polarity prevents phase shift problems. You can find more information on phase shift at the end of the crossover faq.

  Check out the 2-Way crossover help for the formulas.