CV or not CV

[gwbutler]

Hello all,

Interesting trip into work this morning in my 84ksq.  Sequence:

1. Accelerating to merge onto highway

2. At approximately 39mph sound is being emitted from left front side of 
vehicle, sounds very similar to fan kicking on, only significantly 
louder,...and doesn't diminish until I reduce speed to under 39mph (fan works 
normally)

3. Also, sound does not diminish if I take vehicle out of gear or rev engine 
while out of gear (when over 39mph)

While hoping for a simple fix, I'm thinking bearing, CV joint, etc.  As this 
is my first Audi, I'm not sure what the sound characteristics of either 
condition would be...any guesses.

TIA

Regards,

George B.
Massachusetts