First pull out the driver and see if you can spot any cone damage. Cone repair may turn substantially cheaper than purchasing a new driver.
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Also just try tightening the screws holding the driver in the speaker.
Often they come loose.
Now not TOO TIGHT, just tighten a little.
Usually the screws are plain wood threads in fiberboard, and trying to get too much tightness will only strip out the holes.
In fact check all your driver screws every year of so..
The do come loose.