Help - would be appreciated
 

Is anyone experiencing this odd Trumpet Sound type of 'roar' from the front tyre area. My E70 is on run flat 275 front & 315 rear tyres but this is an odd type of noise to be from the tyres. I have had the car checked at the dealers and their put it down to tyre / road roar but I'm not sure !!
Does anyone else hear this noise which is usually between 20 - 70 mph and the noise only changes slightly with different road surfaces - as I say I can only best describe it as a type of trumpet sound
Any help would be appreciated
Happy New Year all !!