Is it possible to shield unshielded speakers?

Ozfly: I think the trick is to ground the aluminum/copper foil.
When a magnetic field passes thru copper, electrical current is produced.
Give the current somewhere to go (ground) and the field is no longer a problem.

I had this very problem myself once.I mutilated a pair of old bookshelf speakers laying around and cut the magnets off of the drivers and used them as bucking magnets.You wont need to glue or anything,the magnets will hold together just fine.Just for the record,I am not familiar with your particular speakers as far as size of drivers but mine were 10in 3 ways that I was shielding and the 4-5in midrange didnt even need it just the 10in driver.I agree with the others,I wouldnt do anything untill you do have a problem,you will know if the drivers are messing with the picture or not.

LCD tvs do not cause a problem

Epoxy bucking magnets to the back of the magnets of your speakers. You can buy the bucking magnets from parts express
and other places.

If you have any doubts re. your tv susceptibility to magnets---Put the speaker right next to the tv. In a min. you'll know.Remove the seaker straight off. Turn the tv off. Wait a few min./turn back on; the tv will degauss itself.------Leaving a speaker there long enough creates perm. burn in--irreversible damage. This refers to all CRT sets--glass tube or rear projection crt's. A boombox or small speaker on top of a glass tube set will create the same hell.---if left there over a long period.