The Great Plains Audio Model 19 is a 12-dB/octave, dual-section, passive crossover network, with a center frequency of 1,200 Hertz. This crossover is designed to replace the original crossover used in the famous Altec Lansing Model 19 speaker system. It may also be used with some of our Great Plains Audio products to compliment many old, or new, 2-way speaker system designs. Air core inductors, polypropylene capacitors, non-inductive resistors, and a heavy 2 oz. copper trace P.C. board, were chosen for excellent audio performance.