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Since a Power Wedge contains isolation transformers it will make some noise. That noise should not be audible unless you are within one or two feet of the Power Wedge in a quiet room. In most cases, you will have to get within six to eight inches to hear any noise from the Power Wedge. Some conditions will greatly increase the volume of the hum. A Power Wedge placed on a wooden surface, especially a flexible one, will use the wood as a sounding board to amplify the level of noise. We recommend the a Power Wedge not be placed on a wooden shelf or floor. If such a placement is unavoidable, placing a thick carpet or rug under the Power Wedge will help prevent an increase in noise. Make sure that the vents on the end of the Power Wedge are left open for ventilation. If the Power Wedge is used in a house with light dimmers, the hum can be much higher. The noise signature of the dimmers is removed by the Power Wedge, but in doing so the audible hum is intensified. The best way to resolve this problem is to eliminate the dimmers. There are no "quiet" dimmers. The hum noise from the Power Wedge will never be audible through the speakers. If there is a hum coming through the speakers, it is likely the result of a ground loop condition.