[RodB]

Welcome to the Phorum Dave. Your speaker is still suspect. The cone is made of paper and over the years it is exposed to humidity and temperature changes causing possible slight warping. This will shift the voice coil to the point of rubbing on the magnet pole. Sometimes a person can feel or hear the rubbing when gently pressing the center of the cone in and out. You will also get a rubbing if the gap of the voice coil becomes dirty or has other particles. The easiest way to check is to substitute another known good speaker.