First make sure you have the position settings correct. To adjust, make sure the CD clamper is at CD #1, then look in back of your Beosound on the top right. You will see 2 rubber plugs covering two holes (it's possible the rubber plugs will be missing - they're not needed). Inside you will see the adjustment screws with arrows. Use a screwdriver to adjust BOTH screws so that the arrows point in the proper direction depending upon how you have your Beosound positioned (e.g. flat, vertical, horizontal). The BS9000 set-up guide (available here on Beoworld or B&O's web site) will instruct you as to which direction the arrows should point.
The glass door is not removeable.