I was just curious if any Shacksters use or have any knowledge of this product? My home theater serves the dual purpose of both theater and living room. We've recently cut out part of a wall and put in bar seating between the living room and kitchen. Since doing so I'm experiencing much more rattling of windows when watching movies. I was thinking of purchasing one of these to place under my SVS PB12-NSD to see if it would help to alleviate this problem.