"Tip" and "sleeve" are terms used with the 1/4" speaker jacks, they don't really apply to Speakons. Instead, the first thing to do is simply plug the cable into the amp and the cab, and see what happens when you play. No damage will occur--worst case scenario, you hear nothing. If you hear nothing, then unscrew the cases of the Speakons, and observe which wire (typically "inner" and "outer") goes to which lug of the Speakon. Make sure they match at both ends. If they don't, then unscrew one and re-do it to match the other. If they
do match already, and there's no sound, check to see if either of the plugs is a 4-pole (has 4 screws for wires to attach). If so, then try different combinations until it works. All it takes is a screwdriver, and some swearing.
Odds are though, you won't have to do anything, and it'll be fine on the first go.