Mfsoa is correct, the bottom posts of the woofer cabinet are connected to the 2 woofers (in parallel).
The upper posts of the woofer cabinet connect to the umbilical jack only. With the binding post jumper plates installed, this allows you to use a single pair of cables (and the umbilical) to run the entire speaker.
We've found the best method is to connect your main cables to the upper cabinet, and use heavy jumpers from there to the woofer binding posts. This allows the purist connection from amplifier to mid & tweeter, and you eliminate the supplied umbilical and the jumper plates at the binding posts.
The upper posts of the woofer cabinet connect to the umbilical jack only. With the binding post jumper plates installed, this allows you to use a single pair of cables (and the umbilical) to run the entire speaker.
We've found the best method is to connect your main cables to the upper cabinet, and use heavy jumpers from there to the woofer binding posts. This allows the purist connection from amplifier to mid & tweeter, and you eliminate the supplied umbilical and the jumper plates at the binding posts.