advice please

iv noticed on my audi a4 tfsi 2005 that i keep getting a small humming noise or a slight noise comming when i some times decellerate from the accelerator i thought maybe it might be my wheel bearing... or it may be my traction but tires dont look bad ... its now becomming more regular .. is it worth cheeking the bearings ?... u dont notice the small vibration when ur in the passenger side but u can hear it very slightly when driving or the passenger can hear it too when the stereo aint on ....

its really concerning me now .. any ideas ?

thanks

ohhhhhhh just to say aswell theres no vibration on the steering wheel nor the gear box... iv had a new lux clutch kit and duel mass fly wheel put on that i have changed 3/4 months ago ..and the miles on my car are on 103,000