that is utter BS. I work for a A/V company, we use Plasmas all the time, and our company doesn't own a power filter. The only thing a power filter does it clean the power signal coming to your Monitor. I hate A hole sales people like that, I'm sure he tried to sell you a $200 HDMI cable aswell. Buying a High end power bar isin't a bad idea, but its far from required.
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