A thin sheet of any metal with relatively high permeability (or magnetic susceptibilty) should help resolve your problem. Mild steel is one option but may not be enough, depending on the strength of speaker magnets and proximity to the TV. If you want better shielding, there are special alloys like "mu metal" and NETIC with very high permeability that are much more effective than mild steel. You can buy these alloys in thin foil sheets too. For info on such alloys, check out www.mushield.com or www.magnetic-shield.com (?). Don't know what the permeability of the "TI sheild" mentioned above is, so I can't say how it compares. But I do know that for shielding sensitive electronic instrumentation, mu metal works very well. Be warned, however, that even small sheets of these alloys can be pricey. (There might be other A-goners willing to go in on a group purchase for a larger sheet to reduce per unit costs.) Fully enclosing the source of the magnetic field (e.g., lining the inside of the speaker) is definitely preferable, but you might get by using a thin sheet of the "good stuff" between the TV and speaker. Hope this helps. Don
How to magnetically shield a speaker????
Help needed!!! Does anybody know how to magnetically shield a TV placed right above the floorstanding center speaker? The TV is on a firm movable platform (can go up to 4 feet high) with my center speaker right under it. I haven't chosen a projector yet, so I'm going to use my TV meanwhile. I saw a couple of links on this subject where they recommended to put the TV/monitor in a metal cage - quite a horrible vision to me. Is it possible to to obtain the same results using some thin foil or sheet? Thanks in advance. Mike.