Wheel Bearing Question

I purchased my 1992 SVX about 3 weeks ago, and have reviewed many postings here regarding wheel bearing problems. My car definitely seems loud, particularly in the 40 to 60 mph range. My problem is it seems very difficult to determine which side the sound is coming from. Do the rear bearings typically go out at approximately the same time? I really enjoy the car, yet am a bit intimidated by the cost of repair. When I purchased the car, the windshield had a crack about 8 inches long. I thought I would just call the Subaru dealer here in Indianapolis and purchase a new windshield and replace it myself. Surprise ($1200). Luckily, I found a used windshield in excellent condition in Kentucky, paid $180 for the windshield and $80 to ship it here. Anyway, I love the new ride.