DM-40 Speakers started making hissing sound

Hi Guys,

Got these speakers a few weeks ago with the DDJ-400. Been having a great time until today, I started playing and noticed a light hissing sound. When I pause the music, it is very noticeable and will get louder if I turn up the master level volume. I then realized it stays when playing music as well. I tried unplugging all my wires and still nothing works. Any ideas?