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.
Subwoofer popping noise...
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.
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. 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.
While this can happen internally in your devices, the more common cause is bad routing of cables.Banca d%27italia. turismo internazionale. novembre 2017
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.Log in. Jump to Latest Follow.
My subwoofer keeps emitting an occasional "popping" sound.
Sometimes it's a really quick double pop others a single. This occurs randomly and only occasionally whether I'm using the system or everything is off stand by mode. There is no hum at all in any of my speakers including the subwoofer whether in use or not, they're all dead silent. I have all my equipment plugged into an APC H15 power conditioner that detects no faults in the outlet with the exception that sometimes the 'wiring ok' LED will go off indicating a fault in the outlet's wiring.
Other times that LED will be on indicating no fault is present. I recently upgraded my subwoofer from a w 10" Realistic to an SVS SB13 Ultra, the popping noise was occurring with the old sub and its now occurring with the new sub as well so I know the problem is elsewhere. I somewhat recently moved into a new place and I was getting this same occasional popping sound in my old sub even in my previous place.
At that time I was using a good surge protector power strip but not a "conditioner" as I'm using now. My previous place was a lot newer with a lot newer electric and I still had the popping even using the old surge protector and my old subwoofer.
I'm guessing there's a problem with my AVR's sub out which is a Yamaha RXV but don't know how to know for sure whether it is or isn't. I don't that that popping from any other speaker in my set up 5. Has anyone else ever experienced this same issue? If so, have you ever found a definitive answer as to what was causing it and how did you correct the problem?
I apologize for the really long post but I tried to include as much pertinent info as possible to give the clearest picture possible about my set up and situation.Menu Menu. Search Everywhere Threads This forum This thread.
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Previous Next Sort by votes. RevoSVK Commendable. Dec 22, 2 0 1, 0. My subwoofer is making rattling noises when the volume is turned up at more than medium.
If i put the subwoofer out the rattling noise stops. I checked for things inside. I found nothing. When i play some songs with high bass the rattling starts even when the bass it at minimum.
Ahmed Ifham Commendable. Dec 22, 7 0 1, 2. RevoSVK :.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.Dance beats music
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.
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.
Subwoofer making a constant knocking sound when not in use
If it makes the noise when the power plug is the only thing plugged in, then I believe it can't be the common ground loop problems. Does it automatically turn off if no signal is present on the input lines? Is the threshold adjustable? And is the once per second knock really that rate. Can you let it knock and time it? Well, I cracked it open and spot-checked all of the connections.My subwoofer is making a humming sound when I have the radio off.
It sounds the way it should when I am listening to music or have the radio on even at no volume, but as soon as I push the power button to shut off the radio it starts making the noise again. 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.
Subwoofer making rattling noise
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Get your answers by asking now.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. 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. The Best Tech Newsletter Anywhere Joinsubscribers and get a daily digest of news, geek trivia, and our feature articles.
Skip to content. How-To Geek is where you turn when you want experts to explain technology. Since we launched inour articles have been read more than 1 billion times. Want to know more?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.Toyota hilux fan belt diagram
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.
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.
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