For example, take the 112A bass driver. With the Zobel network in place, the poster (4313B) has the impedance near 5-6 ohms at 750-1K Hz, which is near the crossover frequency. If you use the cited inductance of 2.5 mH from the schematic you get a corner frequency of 382 Hz, nearly an octave off the 800 Hz cited in the specs. If you use a nominal speaker impedance of 12 ohms, you get closer to 800 Hz. The early JBL data shows the driver at 10-12 ohms, but I do not know if that data includes the impact of the Zobel network or not. Seems to me this network must be included to get the whole system to operate properly.
Next, look at the 066. With the 4 mFd cap and a 10 ohm impedance, the corner frequency is 4000 Hz. Specs say 3000 Hz. With the Zobel network in place from the "4313B" post data, driver impedance is cited at under 5 ohms. This pushes the corner frequency up to 8K Hz. Again, I don't know if those plots are accurate, but they cannot be consistent with component values in the schematic.
And finally the LE5-9. If I use a nominal value of 10 ohms as the load following C1 and L2, and use the calculators for a first order 3-way at 800 hz lower corner frequency, I get a capacitance for C1 of 22.4 mfd, nearly double that of the 12 mfd shown. This means that the actual lower bandpass corner frequency is nearly an octave higher than the 800 Hz cited in the specs, and that of the 112A driver. Similarly, the inductance of L2 is computed at about .44 mH for a upper corner frequency of about 3KHz. The value in the schematic cites L2 at 1 mH, pulling the upper corner frequency to near 1.5 KHz, an octave off the 3KHz spec. This is also strange as it puts both the upper and lower corner frequencies of the bandpass section AT THE SAME frequency of 1.5 KHz. The data plots from JBL show the bandpass section of the 3-way having -6 dB points of 750 and 3000 Hz, as spec'd. But I don't know how they got that data with these components in the crossover.
I am concerned that if I build the crossover as shown in the spec sheet, I will have huge holes near the cited crossover frequencies near 800 and 3K. With the 066 pulled up to 4-8K and the bass driver pulled down to 400 Hz, AND the bandpass narrowed to a hump at 1.5K. Yikes!