Thinking through the issue, a couple things come to mind.
1. Is the suspension (spider) misaligned so the voice coil or former hangs up in the gap? Usually this is audible (voice coil scraping, so not sure about this. If there is electrical signal going through the coil then the motor should move. Another thought is maybe there is internal stuffing in the enclosure that is interfering with cone movement. In any case, worth an inspection to see if there is any physical impediment to cone movement or damage to the suspension. 2. Intermittent connection on the tinsel leads from terminals to the voice coil. Many worth touching up the connections at the terminals with a soldering iron. Check continuity.
Maybe you already did this, but if not, worth a try to see if the driver is OK or repairable. Since you know what driver you bought and and find data for it, is should make it easier to find a suitable replacement if you can get a good match on Thiele-Small parameters.
David
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