I have been using the Mission FS1 AV Speakers system since last November (connected to Yamaha DSPAX630), overall I am happy, they look gorgeous and the sound is better than I anticpated. However I am getting a little bit frustrated by vibration from the centre speaker when there is a loud section of dialogue in the film I am watching, seems to be coming from within the speaker, not speaker wall against bracket ? A prime example would be in Moulin Rouge when Jim Broadbents character screams quite often !! I have tried adjusting the volume and settings on my receiver but without too much success. Has anyone else had this problem and been able to rectify it, or could suggest what settings to use on my Yam receiver ?? Thanks in anticipation ..