This interesting article addresses some of the key issues regarding home theater speaker. A careful reading of this material could make a big difference in how you think about home theater speaker.
The first step is find out where it is coming from. Disconnect your source and display equipment from your receiver or surround sound processor. If the noise stops, connect them back to the receiver or processor on at a time until the noise returns. When the hum comes back, you found where the noise is entering your system. Note that if you are connecting remote equipment, such as running the signal from your theater room DVD player to the TV in the bedroom, your chances to pick up noise increase dramatically. With such long runs, noise can be induced into the long cable runs from adjacent electrical wiring. It is also easy to create a ground loop, because the equipment is plugged into two different, widely separated outlets, on different electrical circuits.
Working together, these speakers create the surround sound experience of a professional movie theater in your living room. You will find several brands and models of good speakers; you have to ensure that they work as a cohesive unit. One very important aspect is voice matching. The best way to achieve this is choosing speakers from the same ‘family,’ by the same brand. Voice matching ensures a smooth flow of sound around you, creating a seamless surround effect.
Sometimes power conditioners will stop noise problems by placing equipment on different, electrically isolated outlets. This is done using isolation transformers. Sometimes this is ineffective however, due to the differences in internal construction of different power conditioning equipment. Some safety regulations, such as UL 1950, specify that an isolation transformer is only allowed to isolate the hot and neutral wires; the grounding wire must be passed straight through. If this is the case, the ground loop problem may still exist because many communication circuits are connected to the grounding conductor and not the neutral. In this case, the isolation transformer, or any power conditioner or UPS with an isolation transformer will have absolutely no affect on the grounding problem.
Truthfully, the only difference between you and home theater speaker experts is time. If you'll invest a little more time in reading, you'll be that much nearer to expert status when it comes to home theater speaker.
The surround speakers, apart from producing sounds like raindrops, or the rustling of leaves, also provides directional effects, such as a locomotive rushing by, a bullet whistling past, or the rumble of a spaceship. If the system includes a subwoofer, then most users prefer either bookshelf or satellite speakers requiring stand placement or wall mounting.
You can solve most noise problems in your home theater or multi room audio/video system by taking the systematic, step-by-step approach. Work your way up the signal chain, eliminating each piece of equipment as you go. If you have nothing connected to your speakers except the speaker wiring, and they still hum, the problem is noise induced into the speaker wiring from adjacent power cables. Other than that case, most problems are caused by ground problems, which you can find, and solve, if you take it one step at a time.
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