Yes, There were holes covered with rubber cover. Finaly, I could change the setting and the noise were gone. Thank everyboby for the precious advise for a newbie.

Yes, I removed the horizontal steel plate bracket from the back of BS9000.

Thank you for your answer, but the way you described is about MK3. The image is not the same as MK2 and couldn't find the two holes at the corner.

Hi, I bought a beosound 9000 MK2 used and I belive that it was hung on wall holizontally. I think the setting for the holizontal braket. Is there any way to change the setting to the vertical one with a stand? It didn't come to with a manual, so I downloaded the MK3 manual from B&O site. However, the back side of mine wasn't the same as