This kit is for a pair of speakers.

This upgrade kit is only compatible with the newer Klipsch RP-600M II speaker,
It includes everything to take this speaker to the next level including crossover parts, wire, 1 sheet of NoRez, and a set of Tube Connectors

If you have the original RP-600M, you will need to purchase the kit for that model from the link below.
Klipsch RP-600M Upgrade kit