TNT, AV equipment is designed to routinely handle surges of hundreds of volts and an extremely unlikely surge of more than a few thousand volts(e.g. an almost direct lighting strike)would destroy the power cords before it reached the equipment. A surge protector might be of some possible use(I use none)fot the in-between area and what you bought is adequate, although as usual the Monster is greatly overpriced and you could have gotten more for $20-$30.

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Enjoy the music, not the equipment.