This upgrade kit includes all of the necessary crossover parts to take this speaker to the next level. Kit also includes: wire, solder, heat shrink and a pair of Tube Connectors.
Crossover boards not included.

NoRez option: Be sure to leave 1-2″ of room behind the woofer holes to allow the drivers to breathe, or the speaker may sound “congested”
We also recommend 2″ of loose stuffing (polyfill/fiberglass) along the back wall, but be sure you don’t block the screw holes that secure the drivers in place.