: Guitar Amplifier cause TV to flicker I have an interesting problem. I have a Marshall MG30-DFX which is placed just behind my LCD TV (Samsung V32F390 if it matters). When I switch on or off my amp, the tv screen flickers.

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Ummmm yeah, well, where to start...
First, why would you place your amp behind a television? That alone sounds strange. Second, that amp has a 10" speaker with a very big magnet, and when all is powered up, that magnet will cause the television to flicker.

For more effects of magnetic power, leave your Rolex on top of the amp for a couple hours while powered up...

And yes, placing your amp behind anything will cause it to sound muffled and your playing will not sound clear. Pull that puppy out in the open.