1999 Impreza "whirring" noise

Our 1999 Impreza makes a "whirring" noise. Seems to be coming from the front right. It only happens between 30-35 mph. (It starts at 30 mph and continues until 34-35 mph). Thought it was the right front wheel bearing and replaced it - didn't help. It doesn't seem to matter if you turn the wheel one way or another. Any thoughts would be appreciated.

Mike