You could use a pcb or a bus bar. Drill two holes in the bar and place one hole on the binding post and secure with a
(secondary)
nut/washer. In the other hole put the inside binding post and likewise secure with a nut washer. Back to back binding posts.
Keep in mind: The length of the wire will offer resistance that will affect your cross-over calculations.
Keep in mind: The length of the wire will offer resistance that will affect your cross-over calculations.