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I think JA is on to something. You've eliminated most of the likely causes right up to the speaker's binding posts. If you have verified that the jumpers are correctly in place between upper and lower binding posts (that means that there is metal-to-metal contact), then the problem is inside the box. Hopefully JA is right and there is simply a loose, disconnected wire to the tweeter. The worst case scenario is that the crossover or the tweeter has failed. In all cases, this is fixable but possibly at an unattractive cost. If only you had some folks knowledgeable in hi-fi equipment nearby......