2000 Audi A4

Noises problem
2000 Audi A4 4 cyl Two Wheel Drive Automatic

I HEAR AN AUDIBLE NOISE WHENEVER THE TOW FROM TYRES HIT A BUMP OR GOES OVER A ROUGH SURFACE, I SUSPECTED THE BEARINGS AND HAD THEM CHANGED, BUT I STILL GET THE NOISE. MY MECHANIC THINKS IT IS THE SUSPENSION ARMS IN THE FRONT, BEFORE I ALLOW HIM TO TAKE IT DOWN LET ME KNOW WHAT YOU GUYS THINK.