Did not work for my in any way...
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Currently, I have five pairs on a pair of floorstanding speakers. Previously, I use them on a pair of bookshelf speakers. In both cases I found them to be very effective. They will work on the sides, but it might be best to put them on both sides for balance. To find the best location, play a recording with low frequency energy and move your hand around the cabinet to find the area(s) of greatest vibration.
I found them effective, even on a cheap pair of Radio Shack LX-8 speakers.
The cabinet sucked, but the drivers were an OK 8" bass/mid, and the top mounted Linnaeum design dipole.
MUSH in the middle, boomy bass.
I put the Tekna-Sonic's on, and heard a good difference. Definitely far from magic, but more than a subtle improvement. Bass still a bit boomy, but the midrange mush was greatly reduced.
I'd recommend them if you really think the cabinet is the main cause of the problem. I think they'd be more effective in the back, as the rear wave probably hits the back the hardest. They may work on the sides, but perhaps not as well, and it might be a little ugly.