You will actually see the Noise Harvester working as it converts all this noise into light. You will easily be able to hear the improvements, and the effect is cumulative: the more Noise Harvesters the better. Place one on any outlet where you have a computer plugged in, a refrigerator, a lamp or light with a dimmer switch and place a few in the room with all of your audio and video gear. This best-selling budget tweak from design team at PS Audio really makes a dramatic audible improvement. Any system will reap the benefits of the Noise Harvester.