!#5: Saving Home Theatre Speaker System: January 2012

!±8± The Best and Easiest Way to Fix a Blown Out Speaker

Stereo speakers are built to last. Every time you turn them on they are submitted to abuse and punishment, even more so depending on the type of music you listen to. For example, music with heavy bass shakes everything in your home. dream what is going on in the speaker cone.

Even the best, capability stereo speakers are bound to crackle from all of this abuse over time. When that happens, you may have the opportunity to save yourself some money by repairing those broken speakers instead of buying new ones.

It all starts with finding the qoute causing the sound problems. It can be an enclosure damaged or maybe it blew out from an electrical or thermal fuse. Problems with the voice coil are a tasteless problem, sometimes the crossover network is faulty and even problems as easy as a solder relationship can be the cause of your problems. anything your speaker issue maybe, it can be fixed. Here is a breakdown of how you can fix a speaker that is blown out.
The first thing you need to do is shape out which speaker is giving you problems. You can beyond doubt do this by playing around with the stereo's equalizer. Alter the balance and the fader to isolate the speaker causing the distortion in sound or if there is no sound at all. Be sure not to have the volume blasting or you run the risk of blowing out a good speaker. Once you've figured out which speaker is the bad one, you now need to take it apart. Try to do this step determined because you don't want to cause further damage to a part which is working fine. take off the faceplate of the speaker and then moderately loosen the seams of the speaker's fabric without tearing it. Now that the speaker cone is visible, you can begin repairing it. Have some tape or glue handy since this is what you will primarily be using if the cone of the speaker is punctured or torn. You'll want to make sure the hole or tear is fully covered before bright on to the next step. Test the voice coil to see if it is damaged in any way such as if it melted at some point for example. If there is even the tiniest of gaps in the coil, no sound will flow from the speaker or it will sound highly distorted, depending on the size. If you see that the voice coil is beyond doubt melted, then just replace the speaker entirely. If you're going to need any change parts, now is the time to order them. They can either be found directly from the maker but they can be high-priced or from stereo specialties shops. An often overlooked fact is to know the part whole or numbers of the pieces you are finding for. They are usually settled on the inside of the speaker or backside of the cone. Doing so will make your life an awful lot easier. Now that you have all parts you need to properly fix the speaker, take a look at how the damaged part is attached to the speaker. Once you take off the broken piece, you are going to need to install the new one the same way. Now that you are all completed putting the speaker back to together, the only thing left to do is test to see if all your hard work paid off. Hook it back up to the stereo and test it at a low volume moderately turning the volume up to see if it can handle. If the speaker is still not working and you feel like did everything correctly, take it to a professional and let them fix it from there.

The Best and Easiest Way to Fix a Blown Out Speaker

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!±8± Eliminating that Terrible Hum From Your Home Theater Speakers

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.