It’s normal. The printer does a resonance sweep at the start of every print. Two different frequency bands, a second or two each time. If it detects that the resonant properties of the mechanics have changed, it will post a warning that you need to tighten belts and clean rods.
Yeah. It’s loud. 
If you get yourself a heavy stone/concrete tile and you put the printer on that, the additional mass will reduce how much the printer’s resonance sweep excites the surface it’s sitting on. That excitation causes some amplification of the noise. The added mass might also improve high speed printing performance depending on how “wobbly” the table/bench is.