Hi all-

i recently acquired an a/d/s/ center (cheaply) to use with M3Ti mains. i noticed that despite a claim that the center is shielded, if it is set on top of my TV it distorts the picture. What makes a speaker "shielded" for video purposes? Is there a particular material in the cabinet, or is there a shroud or surround on the magnet/voice coil assembly?

Thanks- Bill