I've been hearing a Humming sound for the past 2months. It comes from around the car I cannot tell where it's coming from. Checked my tyres they are all fine. I recently changed my tyres they are hankook tyres but I have checked them and they look fine. I went to my mechanic to check the bearings he said they're all fine and he cannot distinguish where the sound is coming from. It is annoying me alot now and just to say the sound is not directly relative to rpm but is to speed. Turning left or right does not changed the noise and when I put it in neutral the noise doesn't changed either. Also road surface does not change noise. I am still thinking it is bearings just cannot figure. Sorry for long thread but this issue is very annoying so trying to give as much info as possible. I also have a video but do not know where to post it. Noise starts at about 20mph and all the way to motorway speeds and my car is a 2005 audi a3 2.0 petrol.
I have attached the video.
Thanks!20160903_155835.mp4