"The Great Stuf could be trusted to push out the panels and maybe loosen the fasteners."Even when it says on the can "will not distort window frames"? ![](http://www.audioroundtable.com/emoticons/winkie.gif)
It was kind of a generic suggestion - a layer of 1" insulating foam bonded perhaps, or something else to increase the section thickness.
The woofers will Adire Tumults - they're currently in 17" H-Frames, but I want to see if I can "kick it up a notch".