Dave, welcome. As both Randy and Ken point out, the strip connecting the top and bottom terminals may have come loose(e.g., through vibration)and left the top section(mid-range and tweeter)unconnected to the receiver if the speaker wire is attached to the bottom terminal. Although it's possible for two drivers to fail simultaneously, it's unusual.

Check for a tight connection and also try connecting the speaker wire to the top terminal if it's now on the bottom.

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Enjoy the music, not the equipment.