I have had these speakers for about 18 months and whilst watching a rental copy of Traffic the right speaker was vibrating and distorting at some points in the film. I haven't noticed this before in films or music so I am wondering if it is poor recorded sound on the dvd or my speaker is playing up. I like to watch loud! and don't want to be distracted by vibrating noises. Any ideas?<br />System: Yamaha E800, Nad 370 and Yamaha SW90 sub.<br />Rears and Centre set to small, Mains set to large, Bass from amp directed to Both. <br />Ps I have checked bass drivers are tightened on speakers.