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It could be the start of an issue with the CV joint. If a vibration is caused by a problem in the half shaft, it's effect will increase when the rotational speed of the shaft matches a harmonic in the car. That's when it would be the most noticeable. However, the speed band you mention (45 - 25) seems a bit wide for it to be a harmonic of some sort. Could also be tire or bearing noise. Does the sound change if turning in either direction while the vehicle is making the noise?

My guess is, if it isn't having an effect other than noise (you can't feel any vibration, the car doesn't pull to one side, etc), as time goes on it will get worse. At that point, the cause hopefully will become more apparent.
 

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KOG said:
Wheel bearing is a possibility.
I agree. The growling sound sure sounds like a wheel bearing. Does the sound change between a left and right turn?
 
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