May 22, 20178 yr Without seeing the traces on the other side or measuring you can't. It is also critical to know the actual impedance of the drivers it is for otherwise you also cannot. I would also add it is probably not so relevant either. Reverse engineering a sub-optimal crossover isn't an exercise in using time well. As for the how, if the circuit path is known you can easily model it either by hand or in software to tell you the cross points. The requirements are knowing the impedance of the driver/s, the values of the Inductors, Resistors, and Capacitors and then it is easy enough. The easiest way to know is to connect the drivers and then sweep frequencies while recording them all and find the 3dB point. If you can't sweep an acquire you can play sine tones and keep indexing the sine tone until you find a 3dB point.
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