What practical significance is there to the particular capacitor, resistor and inductor configuration used to achieve a specific crossover frequency? In other words do crossover points of, say, 800 or 3,000 Hz result in the same electronic end results by any method achieved? As a more narrowly focused question, I am wondering about the desirability, or more appropriately the lack thereof, of using a NLXE990 network (XO at 800, 3200 Hz http://manuals.harman.com/JBL/HOM/Technical%20Sheet/LXE990%20ts.pdf ) in conjunction with L50 transducers (127A, LE5-10 & LE26 - spec XO at 800, 3000 Hz http://manuals.harman.com/JBL/HOM/Technical%20Sheet/L50%20ts.pdf ) in an off-model vintage, but pristine, JBL box similar to the L50 until I can either acquire or build a proper N50 network.