Imagine now fine tuned damped loaded speakers with springs asymmetrically compressed under and over the speakers...
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Now take a piece of 1-1.5" all-thread and drill a hole in the top and the bottom of the speaker, countersink the holes top and bottom and use 6" x 1/2" washers. Now tighten to tone. You can make the cabinet sound like green concrete, if you tighten correctly.. Cost a couple of peanuts at least, all thread ain't cheap.100.00 should do it, used would work, 30-50.00 for 2 pieces of 60" all thread and make the washers.
Master M, you’ve done it again. :-)
Enjoy the holidays..