[cobrin]

remove the door card and check nothing is loose behind or near the speaker refit them again and test. This requires the door handle trim to be removed to access the two screws in it, as well as the latch till you get access to the controls and tweeter harness. torque screws are a must.

If that's not for you simply tighten them a little more and test, or, loosen the outer door card screws and tighten them up.