You’ll find plenty of information online that will show you how, but the task requires moderate skill with a soldering iron and similar tools. If you have the skills, you can build your own hum eliminator for about $10 or $15. There are other products that do roughly the same thing, some of which interrupt the loop in the signal cables, but they’re all expensive as well. If using an extension cord is impractical, you can buy a hum eliminator, such as Ebtech’s Hum X. Look up Lee Harvey and Stone the Crows for an extreme example of what can happen with high-powered equipment. You could just “pull the ground” by using a three-prong to two-prong adapter but this represents a potential shock hazard. Self-powered speakers and subwoofers come to mind. There might be occasions where you simply can’t reach the same outlet with a piece of equipment. If you still get hum, see if your antenna or cable wire has its own ground connection. Rob Schultz Powering connected equipment from the same AC socket eliminates most ground loops. Most multimedia setups can be handled easily by a single 10-amp circuit and most household circuits can handle at least that. As shown below, simply plug all your equipment into a single power strip, surge protector, or power center and plug that into the wall. Rob Schultz One way to create a ground loop is to power inter-connected equipment from different AC outlets: The ground travels through the shielding of the signal cables.Īnything that breaks the loop will remove the noise, and the easiest way to do it is to power everything through a single AC socket. You can see how a loop is created in the diagram below. In the simplest terms, this creates a single-loop antenna that just loves to suck in various types of noise via electromagnetic induction. It could also be a much quieter, yet equally annoying buzz or hum that you only hear when the room is otherwise quiet.Ī ground loop typically occurs when one or more pieces of your entertainment system are plugged into the AC (alternating current) at different locations, then connected together by electrical (versus optical) signal cables-RCA, HDMI, composite, component-whose shielding is connected to ground. The most common manifestations are a loud buzz or hum coming through the speakers, or scrolling bands on a TV screen. The number-one cause of unusual audio noise and weird video is the ground loop, simply because it’s so darned easy to create.
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