Roaring sound at 30-40 MPH has appeared.

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My '10 ES350, with 124,000 very smooth miles on it, has developed a sound that "resembles" a cupping sound from feathered-edge tires.  My tires were about 2/3rd's gone, so I purchased a new set of Michelins this weekend.  Had a 4-wheel alignment done, it was near perfect - no adjustments made.  Sound is still there.  First, while driving on asphalt, on a straight stretch, between 30-40 MPH, it is very evident.  Then, while driving through "s-curves" on smooth asphalt at 50 MPH, it is even louder.  I am at a loss for diagnosis.  Any experience with this from you all?  Any input is appreciated.

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