Can I upgrade my RF 7 or RF-7 II to an RF-7 III?

The short answer is no. There is really no way to upgrade your RF-7 & RF-7 II to a RF-7 III as it utilizes a different network, horn and drivers. Because of the cabinet change it would require severe modifications to make these parts fit. Even if you modified the cabinet to fit the new parts, overall acoustics of the speaker would be effected. That is why we don't recommend these modifications and do not offer upgrade kits at all for these models. 

Please note that modification to the cabinet or speaker parts will void the warranty on your Klipsch speakers.