My car makes a growling sound that I also can feel as a vibration through the steering wheel. The frequency of the sound goes like the wheel speed. It isn't /very/ loud, and at first I though it might be tire noise, but it is noticeable and could be heard by a passenger. It seems it is coming from the front left, but I'm not sure about it actually is. It is lessened a little when turning left, but it becomes a lot stronger immediately when I turn the steering wheel even a little to the right.
The strength of the noise/vibration has some dependence on vehicle speed. As I accelerate, it is strongest from around 15 mph to 35 mph and above 45 mph.
I don't know whether it is related, but the "Traction Off" warning light is always on, meaning that the Traction Control System (anti-spin system) detects a fault somewhere and shuts down.
1995 Park Avenue Ultra, 162K miles