LF section, I'm not sure, maybe this is inside the woofer cabinet and the two jacks on the HF network are just in parallel. Ok, looking at this it's a choke and a cap, that's a Low Pass Filter for the woofers, 12/db octave slope. Simple, so this chases the high notes away from the woofers. If you plan on using in high-power bi-amp applications, I'd consider bypassing this.
Had to get inside the LF cab thru the driver to fix 2 nuts that came loose to the grills. Here's a pic of the xo for your archives 
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