Joinsubscribers and get a daily digest of news, geek trivia, and our feature articles. It may sound like a buzzing or whining when doing basic tasks, sometimes escalating with more intense use like games or streaming movies.
There are dozens, maybe hundreds of explanations for unwanted sounds coming from your speakers. Luckily, the most common issues are fairly obvious. Broadly speaking, we can break them down into three categories: problems that originate from the physical speakers, the cable connection, and from the PC itself. To see if the speakers are the problem, simply plug them into an audio source other than your PC—like a phone or an MP3 player. You can perform the same test in reverse, too: get another set of speakers or headphones and plug them into your PC.
If you still hear the unwanted noises, your PC is likely to blame. If you hear clearer sound with no interference, then the cable was the likely culprit. The fix here is simple enough: just use a different cable, preferably one with a high-quality jack and better shielding. You might be able to isolate specifically which speaker is damaged by listening closely, especially if you have a subwoofer or an elaborate surround sound setup.
This makes things cheaper and less complex, but without proper electrical shielding, it leaves the audio jacks vulnerable to interference from the CPU, graphics card, memory, and just about every other component in your computer. This can cause a buzzing or whining sound in your speakers and headphones.
Subwoofer popping noise...
Switch to a different audio port. Most full-sized desktop computers have one headphone jack on the front of the case for convenience, and another on the back for those who prefer a cleaner look. If multiple headphone jacks are present, plug it in to the green one.
Install a full sound card. They also use dedicated, high-quality components to output pure sound in digital and analog formats. Use a USB sound card.
Switch to USB speakers or headphones. The Best Tech Newsletter Anywhere. Joinsubscribers and get a daily digest of news, comics, trivia, reviews, and more. Windows Mac iPhone Android. Smarthome Office Security Linux.
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Want to know more?Everyone can appreciate the value of a good subwoofer in a home theater system. Getting good reproduction of the lower end of the audio spectrum gives sound a more full and realistic quality, and at the lowest audible frequencies and below, a subwoofer adds a tactile quality to home theater -- some things are not so much heard as felt. Unfortunately, there's another low-frequency signal present in every home, which isn't quite so lovely to listen to: the cycle hum of the AC power lines that power everything in the house.
In a perfect world, power hum wouldn't ever get into the audio signal path, but in this respect, our world is far from perfect. There's nothing that can more effectively dampen one's enthusiasm for a nice powered subwoofer than a persistent cycle hum -- and since a subwoofer is intended specifically to do a good job of amplifying low-frequency signals, when a sub hums, it can hum very, very loudly. The "brute force" method for getting rid of cycle hum is to filter it out, but that's not a particularly desirable solution.How do you change a fuse in toyota tacoma full
Some parts of a low-frequency audio signal are themselves around 60 Hertz, and a filter doesn't know whether a particular wave is part of the intended sound or is noise -- it just strips it out. To get rid of hum without having to throw out some of the desired audio at the same time, we need to start by understanding what the various possible causes are.
The four principal likely causes of hum are: 1 Electrical defects in the powered subwoofer; 2 Induced noise in the audio signal path, most likely around cables; 3 Ground loop noise resulting from different ground potential at the receiver and the subwoofer; and 4 Noise arising from these causes in or between other components upstream of the subwoofer.
The things that will solve one of these problems will not solve them all; and it's entirely possible that you have more than one factor contributing to your problem, so if something helps, but doesn't resolve the issue, keep trying.
Unfortunately, sometimes the cause of a humming subwoofer is simply the subwoofer itself.How to Fix Your Klipsch Subwoofer
Any audio reproduction device that runs off of our regular AC power has got to tame that cycle noise in the power supply, convert it to nice level DC voltages, and protect the audio circuitry from the power supply sufficiently to prevent hum from getting from the power supply into the signal path. Internal failures, however, can mess this up. In most cases, this is pretty easy to detect: disconnect your subwoofer from everything except power yes, unplug the incoming signal cableand power it on.
If it still hums when there's nothing going in, your issue is probably with the sub, which needs repair or replacement. Induced Hertz noise is hum that comes into your audio system through contact or proximity to power circuits or cables.
Subwoofer making a constant knocking sound when not in use
While this can happen internally in your devices, the more common cause is bad routing of cables. We sometimes find that people have routed power cable and audio interconnect cable through the same conduit or cable tray -- definitely a no-no not only from a noise point of view, but also from an electrical code point of view.
Current moving in a cable creates a field around the cable which can cause a similar current to flow in nearby conductors -- this is the same sort of thing that's going on when you experience "crosstalk" in telephone lines, bits of signal that bleed over into neighboring wires.
Induced noise, if entering through cabling, is usually fairly simple to solve. The key to understanding how to fix it is the square-of-the-distance rule: the intensity of an electrical or magnetic field diminishes by the square of the distance from its source. So if a power line one inch away from your subwoofer interconnect is inducing a signal in it, that induced signal will be a quarter as strong at two inches, a ninth as strong at three inches, a sixteenth as strong at four inches, and so on -- the farther you can keep the two separated, the weaker the effect will be, so it's time to move some cables and see what happens.
If you've got power cabling lying directly on or under a sub cable, just a couple of inches of separation can make a profound difference. Shielding, too, plays a role in dealing with induced noise. The most effective shielding for low-frequency signals is braid, not foil, and a highly-conductive, high-mass shield will shunt more noise to ground than something more lightweight -- see our article on hum rejection in analog audio cable, which inspired our design of the Blue Jeans Cable LC-1 audio cable with its double-braid high coverage shield.
It's important to recognize, however, that the kind of low-frequency, high-energy field set up by a power cord is the hardest thing there is to shield against -- all shields are somewhat ineffective against it, and so while a heavy shield such as that on the LC-1 can help, minimizing close contact between power and audio circuits will almost always be the most important thing you can do to solve an induced noise problem.
Now, induced noise can be trickier than that, not least because the problem can be occurring inside of equipment -- bad isolation of power circuits from line-level audio inside a powered sub is something which no amount of work with cable placement or shielding will affect -- but with any luck, the problem isn't internal and these solutions will address it. The other common cause of subwoofer hum is completely different -- ground loop current flows -- and attempts to fix the hum problem that work well for induced noise will be quite ineffective against ground loops noise, and vice versa.
A ground loop problem occurs where there are differences in ground potential between pieces of equipment, which causes a small amount of power current to flow along lines which connect the two.
This flow, in an unbalanced circuit that is, where the signal is carried on a single conductor using a ground return path, e. Ground loops can often be resolved without spending any money on the problem. The trick is that one needs all of the grounds on all of the gear to have the same potential.
Sometimes this is as simple as getting them all plugged in to the same power circuit; sometimes it's a matter of making sure that you're only using modern, three-wire, earth-grounded circuits at all points in your system rather than using old two-prong ungrounded circuits. Changing where things are plugged in, making sure your home power circuits are all properly grounded an outlet-checker from the hardware store can be handy! Beyond that, if your home wiring has serious grounding issues, you may need the aid of an electrician.
There can be ground loop issues that even an electrician can't solve, though -- many home theater devices are not earth-grounded these will usually have a two-prong, rather than three-prong, power plugand instead use a kind of pseudo-ground which is tied through resistance to the neutral side of the power circuit.I've got a 6 year old JBL 10" subwoofer home theater sub, not a sub for a car that has suddenly taken to making a constant rhythmic knocking sound, even when not in use by the receiver.
The sound is similar to a hammer somewhat high-pitched for a sub against wood, and it is about once a second. I awoke to it doing this last week and had to pull the power plug to get it to stop. Plugged it back in after a day and have used it a few times during the week without issues. Then today, I awoke to it making the sound again and had to pull the power.
I guess I'll just replace it if it's truly met it's end, but I didn't know what would cause that or if there's something simple I might to try to fix it. I've tried a different surge protector, but that's about it. You can open it and look for a small rat with a tiny tool belt and baby hammer How do you know it is "not in use" by the receiver. Is the cable actually unplugged. I had a similar problem with a bookshelf speaker about 10 years ago.
It wasn't the speaker but the receiver. Have you tried the sub somewhere else to determine if it actually is the speaker and not the amp sending a bookied output to it. The first thing I tried was unplugging the audio cable - the sound continued. The only thing I can envision entering the sub would be a rat or very large bug - I'll crack it open and see if any intruders made it in.Trap sound effects
The rate of the sound is unusual but it has developed some kind of ground-loop. As long as there is a signal in, even if it's with no sound, it will probably be quiet. But you need to check out soldering-points and probably caps in the amp in that thing. Assuming the sound stops when you yank the power-cord Sounds like something is going wrong in the sub amp's electronics. It may be an auto on function miss-triggering or something is shorting out and triggering a thermal protection relay.One of the most annoying -- but difficult to find and solve -- problems that can crop up in a home theater or stereo system, is a ground-loop subwoofer hum.
A ground loop is an electric difference of potential between various ground points throughout the system. Ideally, all ground points have zero volts between them. When a ground loop problem exists, you'll hear a low frequency hum when you plug any audio or video components -- including subwoofers -- in the electric outlet. Although some people like trying to stop subwoofer hum by using a power conditioner, in most cases it doesn't help [source: Lofft ].
Instead, try the following steps to stop subwoofer hum. How Speakers Work. How Surround Sound Works. Can you connect a subwoofer to an amplifier? If the subwoofer is plugged into its own outlet, plug the subwoofer's power cord into an outlet shared by the other components.
How to Stop a Subwoofer Hum
Use an extension cord if necessary. If the hum persists, and your system includes a cable TV, disconnect the cable line. If the hum stops, install an isolation transformer on the cable. If the hum persists, disconnect the remaining component cables one at a time until the hum stops. Install a coaxial isolation transformer on that cable.
If the hum persists, install a line-level ground loop isolator on the subwoofer's line-level feed cable.
This usually solves most hum problems. If nothing helps, disconnect all the audio cables from the subwoofer. Leave the subwoofer plugged in and switched on. If the subwoofer hums, it points to a defective unit. Contact the company's customer service to technical support [source: PartsExpress ].
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I bought this stuff from Circuit City, but rather then wasting 3 hours there for them to fix it, is there anything I can do to fix it myself? I do not know much of anything on subwoofer hookup so I will need you to be specific. Sounds like power supply hum. You need better capacitors in the power supply to filter that out. Sub woofers and speekers make a humming sound when they are on but the music or radio is not on. Check if there is a way to turn the subwoofer off when you stop listining to the radio.
Check the users manuall or call the dealer ship and ask them. Or, if it is a car you have had for a while and the subwoofer just started doing this, bring it to the dealer or a car sound system store like "sound FX". All of the following could be going on power is still being supplied to the woofer from the amp, and your amp is not being turned off from the head unit check your remote lead and make sure it is hooked up to a remote only wire and not to a constant power, thus this should resovle your problem.
The way to check this is by using a volt meter, with the radio off check the terminal on the amp that say remote for power there should be none there and if there is power there likely if it is 12 volts is what it will be have your wiring behind your head unit rewired correctly. Sounds like an occilation from the power booster.
Killing the power to the booster as well as the radio should quiet the woofers. Answer Save.
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Still have questions? Get your answers by asking now.Bass represents one of the driving forces of many types of music. Good bass reproduction enhances the musical experience, whether listening to it or creating it oneself. A vibrating woofer or subwoofer creates sounds that don't belong in the music, sapping the joy from the listening experience.
In many cases, removing unwanted vibrations requires only a little work and then it's back to good vibes once again. Hook up your sound system as you normally would and play the bass-heavy music loudly until the woofer rattles or vibrates. Inspect the woofer's speaker cone. Is there a visible tear? If so, it needs replaced. If not, put your hand around the ring of the woofer as if holding it to the speaker cabinet. Does this stop the rattle? If so, padding is needed between the woofer and the cabinet.
Proceed to the padding section.
Inspect the face of the woofer cabinet for loose parts. Are any screws loose? Is the speaker housing loose? Search closely for any visibly loose parts.Ethical problems ppt
Is the cabinet itself the problem? Tighten any loose screws discovered in Step 3. If the cabinet itself is the source of the problem, add more screws to tighten the box.
Test the woofer again by playing loud music. If it still vibrates, proceed to the "padding" section. If not, problem solved! Locate the screws holding the woofer into place and unscrew them. Place the screws somewhere safe. Pull the speaker out of the cabinet. Disconnect the wires connecting to the speaker. Do this only if the wires are easily removed. If not, work around them. Cut out the circle of foam or cardboard. Draw a rough circle inside this circle, approximately half an inch from the outer edge of the foam or cardboard.
Cut out the area inside the inner circle, resulting in a ring of cardboard or foam. Slide this over the back of the woofer so it lies flat against the backside of the ring around the subwoofer. Cut a slit in the foam or cardboard if the speaker wires are still attached, to slide it over the woofer.
Retest the woofer by playing loud music through the speakers. Repeat any steps as necessary if the vibration is not gone. How to Repair Vibration in a Woofer. By : Kathy Adams. Share Share on Facebook. It's possible to remove unwanted vibrations from a woofer yourself.
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