Wheel bearing noise

I just bought an 07 Legacy 2.5i with 53K miles. There was a slight "droning" noise ( "hum", "hum", "hum" etc.) coming from the front left beginning at about 55 MPH and seeming to fade away at about 63 MPH. I thought it was a tire but when I replaced all 4 tires the slight droning noise continues at the same speed range. Could this be a wheel bearing beginning to go bad? And how much $ to get it fixed at the stealership?

Usually a wheel bearing will make a howling or moaning noise and will be present at all speed and get louder with speed. Does it do it all the time or only on a certain road? Sounds weird but I get a strange sound on this 1 short stretch of road going into work. I know it's the road because it's the only time it does it.

If it isn't constant it's most likely not the wheel bearings, it would be more of a squealing/howling sound

Thanks for your opinions! I'm relieved. It doesn't seem to matter what road I'm on. I'll keep an ear on it.

My rear wheel bearings started to go bad after 50000 miles. The sound was most noticeable above 30 mph and sounded like I had old bias-ply snow tires on the rear. There was no squealing, just a moaning noise increasing proportional to speed.

And how much $ to get it fixed at the stealership?

 

It should be covered under powertrain warranty