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Peice Rear Main
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You've all heard it, that dreaded 60Hz hum through the speakers of a home theater or house audio system. Hopefully you heard it at a friend's house and not your own. It can drive you completely nuts. You may have even tried, unsuccessfully, to fix the little noise problem. That can make you even more crazy. What causes that horrendous noise through your speakers?
More often than not humming through your speakers is caused by a grounding problem. There are three main ground problems that cause problems in an audio / video system. These are ground loops, improper grounding and lack of a ground altogether. The other possible culprits that can cause noise are bad cables, a faulty piece of equipment or electrical noise from a lighting dimmer or electric motor. There are steps you can take to troubleshoot the noise and eliminate it from you theater.
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.
If the noise is caused by a cable box, the noise is likely caused by the cable TV ground. To test this theory, disconnect the incoming cable TV feed to the rear of the cable box or TV while they are still connected to the rest of the system. If the noise is eliminated by disconnecting the TV cable, the problem is the cable TV ground. You can electrically decouple the cable TV feed from your system with a ground breaking transformer. These are available from many sources. Be advised that many newer, digital cable TV systems require any device in the signal chain to pass a full 1,000 Mhz. Some of the older ground break transformers will not do this. Be sure to check the specifications of whatever device you are purchasing to verify it will pass the digital cable TV signal.
If the noise is from your projector, TV, or monitor, it is most likely caused because the video display device is plugged into a different outlet than the other a/v equipment. It could be on a different circuit as well. These circuits may have two different ground potentials. That is, the resistance to ground is different on each circuit. A difference in resistance to ground from one 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 internal audio signal ground, you will get a hum.
You can use an isolation transformer, similar to the type used for cable TV ground problems, to eliminate the electrical connection from one component to the other. These transformers are inserted in line with the audio signal connection between the two components. If there is no audio connection between the components, the problem may be current flowing through the video portion. In this case, a video isolation transformer should be used to eliminate the ground loop.
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.
The noise may be generated externally, from a dimmer or refrigerator compressor for example, and coming in through the main power input on the audio video equipment. In this case, a high quality power conditioner may be effective in reducing or eliminating the noise problem. You may also find that one of the signal interconnecting cables in your system is faulty. This can also cause noise problems. Check for this by swapping the cables with one that you know to be good.
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.
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
Different Varieties of Bluetooth Earbuds
Wireless Earbuds are available in a number of shapes and sizes. What separate earbuds from other headphones out there is that they are positioned directly into your ear. Following that, there are numerous ways to design and style the remainder of the headset. Here are a few samples of the main varieties of Bluetooth earbuds that you can buy.
One Ear Wireless Earpeice
The most used kind of Bluetooth earbuds are placed within only one ear. They are often intended for making calls while driving a car or doing something else using your hands. This allows you to keep the ear peice on while it's not in use. One ear is available to listen normally while the other is equipped with the Bluetooth device in it, able to take a phone call when required.
These products also normally feature a built-in mic for use with making calls. It's not advised that somebody use this type of product to listen to songs simply because you won't be hearing it in stereo as most music is supposed to be heard. There are many varieties of these gadgets that you can buy.
Over the Ear Earbud Headsets
It's a subtle variation, nevertheless over-ear earbuds are different from over-ear headsets. Where over-ear earbuds actually cover your entire ear inside of the actual speaker units, the earbud kind simply wraps around the top of every ear as a way to offer a far more steady listening experience.
Some folk have trouble holding regular earbuds within their ears. It could be that their ear canal is actually formed in a manner that isn't conducive to fit earbuds, or maybe because they're working and perspiring, the earbuds fall out. Over-ear headphones are perfect for these people.
Sporting Earbud Headsets
Sports earbud headsets are similar to the over-ear style, except that these are a touch more rugged and made especially for energetic individuals. Unlike their over-ear cousins, these earbuds come in one complete rigid component, that means there won't be any cables. This enables the product to fit more tightly around the head of the listener.
The battery on these types of headsets is generally situated in the back, as opposed to immediately at the rear of the ear like they are on the over-ear style. This delivers a more pleasant experience while allowing the individual to don a helmet and also other head-gear that might be important for certain activities.
Conventional Earbuds
The standard earbud design consists of two tiny earbuds placed into the ears with the cables dangling down. This is great for individuals who are not looking for anything to wrap around their ears, neck, or head. These gadgets normally have a central control device which usually houses the battery and also some controls like noise volume and phone switching keys.
The one downside to the standard earbuds is that they are not actually wireless. You still will have wires hanging from the earbuds to the control system, which usually then must be stored somewhere on the body. The perfect use of this product is during scenarios where by you're listening to songs from something similar to your computer or your home music system. You then have the mobility to get up and walk throughout the room without interrupting your music listening experience.
About the Author
Bluetooth earbuds are the best way to experience personal wireless music! Visit My Bluetooth Earbuds to learn more about these amazing devices!
Chanels for subs?
Im planning on having fun this weekend wiring some subs into my wagon with a small 2chnl amp.
Do i need to somehow combine the four chanel outputs of my car to run to the amp? or will i be able to say feed one amp input off the rear right and one amp input off the rear left lines and it will sound normal and contain all of the sound sent by the stereo.
Also i do not plan on making a heavy boxed frame for the subs i am going to cut a peice of material and have it framed in it and that peice screwed to an opening in plastic in the rear of the wagon in a similer fashion as the regualr speakers are mounted.
Is that a bad idea? im only really concerned if its gogin to be so horrible of a place for it that i will regret having started the weekend project to begin with do to vibration noise, if its not a big deal please let me know.
Lastly my freind has a capacitor wired in parallel to his main line, at what point do i need to install a capacitor? im looking for small 8in subs
You only need the rear speaker outputs; your sub mounting is suspect but probable if you have good fasteners. Be sure to locktite them so your not constantly having to retighten them. You won't need a capacitor with a small amp.
1998 Chevrolet Venture LS from North America - Comments
I was looking for a headlight assembly for my 1998 Venture and I came across this site. It seems like a lot of people have the same problem. Is there any alternative to spending $300 on a whole new assembly? The lens came off and is lost. Help!!
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