I should probably have said magnetism in the speakers. My point was more that the amps and stuff dont have any effect.

The magnetic fields produced by the speakers can't hurt your LCD! CRT monitors are sensitive when they are constant magnetized. But in the speakers the magnetic field alway changes his direktion and cannot indicate a constant magnetization. And you have an LCD, the technics is more perfected. By the way, the power supply in your LCD surely causes a similar magnetic field!