I would like to submit this Question again. How can I tell if the speaker on top of my TV is correctly shielded? I have a small shadow developing on the top left of the screen, but the speaker is in the top centre some 12 inches away. If I had a shielding problem, would the shadow appear directly below? If this not the fault of the speaker, can anyone suggest a reason why this is developing? The TV is a Loewe 32" (CRT).