Im having this problem on my 01 focus zx3. When i hit a dip or speed bump on compression i get a deep ruump type vibration. Seems to be coming from the pass. side of the car. Wheel bearings are fairly new, nothing is rubbing i just cant seem to figure out what is causing this noise/vibration?? Buddy of mine said ball joint....
Possible dead strut and or strut mount,Ball Joint,Tie Rod or sway bar link/bushing. Very unlikely to be a wheel bearing unless it has a massive amount of free play.