You've all heard it, that dreaded 60Hz hum through the speakers of a home theater or home audio system. We hope that you heard in the house of a friend and not the your own. It can drive you completely crazy. You may even have tried unsuccessfully to resolve the problem of noise while. This can make it even crazier. The that makes the horrible noise through your speakers?
More often humming through your speakers is caused by a grounding problem. There three main problems that cause soil problems in a system of audio / video. These are the ground loops, improper grounding and lack of land completely. The other possible culprits that can cause noise are bad cables, a faulty piece of equipment or crash a light dimmer or electric motor. There are steps you can take to solve the noise and eliminate it from the theater.
The first step is to figure out where it is coming. Disconnect your device source and display from your receiver or surround sound processor. If the noise stops, connect them back to the receiver or processor time until the noise. When the buzz back, you thought that the noise is entering your system. Note that if you are connecting to remote equipment, such as the alarm signal from your living room DVD to TV in the room, your chances of getting noise increase dramatically. With such long runs, the noise can be induced for long cables for wiring adjacent. It is also easy to create a ground loop, because the equipment is connected to two different, very different takes on different electrical circuits.
If the noise is caused by a cable box, the noise is probably caused by reason of cable TV. To test this theory, turn off the TV input cable to the back of the cable box or satellite, while they are still connected to the rest of the system. If the noise is eliminated by turning off the cable TV the problem is the land of cable TV. You can separate the power supply cable from your system with an innovative transformer. These are available from many sources. Be aware that many newer, digital TV systems require any cable device in the signal chain to pass a total of some 1000 Mhz more processors to break ground will not do it. Be sure to check the specifications of any device you are buying to see if it will pass signal digital cable TV.
If the noise is from your projector, TV or monitor, the more likely it is caused because the device video display is connected to a different outlet than the equipment of another / v. It could be on a circuit different too. These circuits may have two different ground potentials. Ie resistance to earth is different in each circuit. The difference in resistance to earth of a ground point to another can cause the dreaded ground loop. If you get a ground loop, current flows between the two components. If the current flows through the components on the ground of internal audio signal, you will get a buzz.
You can use an isolation transformer, similar to the type used for problems of cable TV land, to eliminate the electrical connection of a component to another. These transformers are inserted in line with the signal audio connection between the two components. If there is no audio connection between components, the problem may be the current flowing through the video. In this case, an isolation transformer video should be used to eliminate the ground loop.
Some Sometimes power conditioners will stop noise problems by placing equipment at different points electrically isolated. This is done by using isolation transformers. At Sometimes this is ineffective, however, due to differences in internal construction of different equipment power conditioning. Some safety standards, such as UL 1950, specifies that an isolation transformer is only allowed to isolate the hot and neutral wires, the grounding wire should be passed straight through. If this is the case, the problem of ground loop can continue to exist because many communication circuits are grounded conductor and not neutral. In this case, the processor isolation, or any power conditioner or UPS with an isolation transformer will have absolutely no effect on the problem of grounding.
The noise can be generated externally from a dimmer or compressor refrigerator for example, and entering the main entrance to power of video and audio. In case, the power-quality conditioner may be effective in reducing or eliminating the noise problem. You may also find that one of the signal cables connecting to your system is defective. This can also cause noise problems. Check this by swapping the cables with one that you know to be good.
You can solve most problems noise in your home theater or multi room audio / video system, taking a systematic, step-by-step. Work your way up the signal chain, eliminating each equipment that you go. If you have not connected the speakers except the speaker wires, and they still hum, the problem of noise is induced in the wiring cables speaker adjacent. Except in this case, most problems are caused by problems of soil, which you can find and fix, if you take it one step at a time.
Steve has 15 yrs in the consumer electronics industry. He is a CEDIA certified designer with ISF and THX certificates. His experience includes: installer and programmer; system designer; business unit director for an a/v importer; sales rep for a CE distributor; and principal of a $1.5M+ CEDIA firm. He’s now senior sales engineer for Digital Cinema Design in Redmond, WA. For more information on how to make your home theater better, and what’s on the horizon, including CEDIA and CES show reports, see The Home Theater and Automation Guide
Erik Meyn – Ringetonetrall (A ring tone hum)
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