Marantz

Hi, you will need to get a fine flat head screwdriver and pry the top back (the top is also the sides). Looking down at the top, there is a lip at the front where the top butts up against the front face. Put some cheesecloth or other material around the tip of the screwdriver so not to scratch anything - put the tool in the tiny gap and twist the screwdriver a little at a time and you will see the case move backwards. Once you see this you should be able to slowly work the case backwards to remove it. It's easy once you get where you need to put the screwdriver. I had same problem with mine. I would love pics on where the power fuse is to replace it with a Synergistic or whatever. 

SA 11s2 owner here. good to see some discussion of how to make the unit sound better. I will be trying the main fuse replacement shortly. One reminder - check your filter setting. Mine was somehow set to three, probably for a long time. I went back to one and found more clarity and a more natural bass response out of my ProAc D15's.