Axiom will ask you why you are running sweeps as they did to me once long ago when I was mapping the frequency plots of my room. The buzzing may not mean a driver is bad, it can be a vibration of something internal in the speaker or room in which you think it is the driver. Also, air can escape around the CNC cutout opening for the driver at certain frequencies causing a buzz, you can try snugging up the driver. Certain frequencies will create a buzz based on the dimensions of the room and location near walls. Anyway, unless it sounds bad when listening to music or watching movies I would not worry to much. I don't think they will replace a driver on warranty based on a sound using frequency sweeps, the drivers are tested at the factory. If you can prove there is something wrong with the driver that is a different story.
