NEC MultiSync FE950+ Question

Hello-
I noticed on my FE950+ when I look close up at the monitor text isn't completely still. In other words, there's some kind of 'glitchy' movement around letters. Is this normal for this monitor? I just purchased a 4.1 surround system and noticed when the bass of the subwoofer hit, the monitor's image would shake. I don't know if this has anything to do with the problem, if indeed there is a problem.

Thanks a lot

Alternatively it could be vibration on the CRT caused by the bass tone itself. I think magnetic interference is more likely though.

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