Rumbling ?

When I lower my needle in the grooves music is first to appears....soon to be accompagned (from the first second or some other lime a little later) with a steady rumbling low frquency sound that has my powered subwoofer going wild........all stop the moment I remove the needle from the record.
It did go away a couple of days ago for a while after I had played a bit with the arm's various adjustments
but it is back again.
Any recommendations ?