First find a parking lot where you can ' go around' the speed bumps.... and go over them with just one side of car until you see if it sounds more on one side than the other... if it does not seem more on one side then it is likely something connected across the two.. in the steering.....
Then you are going to need to look carefully for signs of scrubbing.. places like the top and bottom of the shocks... the control arm bushings..... the balljoints ..... may have to look close because it does not take much travel for some of these noises to sound loud.. many travel through the frame and echo in the passenger cabin...
You do need to find this.. there is nothing which is supposed to make that noise in your car...so something ( maybe important) needs tightening or replacing...