Buzzing speakers with Denon MC 4000

Ok so I just bought a MC 4000 Denon controller to replace my Gemini GV4 controller for my VDJ and as soon as I connect the controller to the speakers there is a Buzz that I don’t hear or get with the Gemini Gv4, it does the noise weather i connect with RCA wires or XLR. also I did a gig and one of my powered speakers signal board went out so I don’t know if the buzzing contributed to the speaker damage, can you elaborate on this issues or should i return the MC4000 and buy a different controller ?