Try placing a layer of felt on the entire baffle surrounding the MTM array. Cut it to fit around the driver flanges as tightly as possible. You can find double sided tape that is used for "hemming a dress" at the same fabric store that you pick up the felt at. Use the tape as an outline around the drivers and around the edge of the upper baffle. This will hold the felt in place and allow you to VERY EASILY remove it with no damage to the baffle should you not like the effect. Sean
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PS... You really need to get some type of a rack that will both support all of your components and allow them to breathe. You would be better off moving your Marchand off of the top of your B&K amp and placing it elsewhere in the mean-time.