Subwoofer hum boxes
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.
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Nvidia Ground Loop. Noise under load. Search Join Now Login. Sort By. Notification Preferences. Forum Actions. Report Post. Thanks for posting, that saved me some trouble. Is the inside of your case painted? I have seen someone fix a noise injection issue by removing paint from around the mobo standoff's; but now struggling to find their post. When I threw this rig together I didn't bend the little flaps on the IO shield out the way enough and they're blocking entry to the onboard GPU HDMI slot, since I need to remove the mobo to get to this; I will try removing some paint at the same time, but remain doubtful.
The noise is coming from the NVidia graphics card. Are you using active powered speakers with balanced inputs? They are also great for recording audio if you play an instrument. This was the only reason I bought the Marantz AVmk2. I contacted Marantz directly about the issue a few weeks ago and got talking to an engineer. He says the balanced outputs of the Marantz only stop ground loops on the outputs and can't stop a ground loop coming through an input.
It's definitely a ground loop as if you plug headphones into the Marantz the hum wont be there. The inside of my case is painted black. Not tried removing paint but I've use plastic washers and tried covering the standoffs with electrical tape as well as the entire graphics card I've tried foil, lead, everything you can think of.
I just got my electrician mate to build a custom plug socket with an oven type on off switch that lifts the pc ground. I can literally have a game running with massive noise then push the switch and it disappears. As bo3b mentioned the noise is there as there are too many grounds. Unless you are stood in a pool of water touching the inside of the PC and a radiator at the same time whilst their is a fault in the PC you don't have much chance of being electrocuted.
I'm going to do the same with this PC and then wall mount it out of the way. If there was a electrical fault with the PC it wouldn't be working anyway. I'm not saying do it, as I know there is a risk, if you find a better way let me know.
You could always the the Ebitech Hum eliminator boxs too. Not active speakers, just a power amp for a sub which will form the other side of this ground loop.
Tried braking the shield on the RCA to TS at the power amp side but that just caused the sub to hum badly. Have any of you tried audio ground isolators? They're transformerbased so it means analogue signals only.
I can also imagine that the lower bandwidth would be a little limited due to the transformers. With a quality solution this should be neglectable though. Lifting PC ground worked. Would grounding the chassis to a nearby radiator be safe? I couldn't tell you. Get an electrician in who knows what they are doing. Glad you got rid of the hum. Those type of products reduce audio quality. They are basically a filter. This would probably work but im running a 7. Nvidia need to work on the EMI as its off the charts!
The sound quality is so much better too. Maybe powerDVD will add it one day so I can get rid of this prepro and get a professional soundcard again. Sounds like they need to shield the soundcard part for the graphics card more as its too close to the GPU chip itself. I did some reading about ground loops, thinking it may be the additional length of mains cable between PC and outlet vs outlet and amp causing a difference in potential, I decided to try the PC sat right beside the AVR cabinet, again plugged into the same outlet, with a shorter mains and connected to the AVR with just a 1m HDMI; the noise was insane!
Tried again using the lifted mains cable on the PC but that just changed the frequency not severity. Since my only other option appears to be running the PC ground lifted, back at the other side of the room and I will most likely be re-building it into a wooden box; before doing so I'll test with the GPU and its CLC removed to see if it's clean from IGPU alone. I feel your pain.
I wish I knew more about groundloops and how to prevent them. I have a limited understanding but it half makes me want to start a physics degree! I have a degree in music production and after working in so many studios and seeing the amount of equipment with power ground lifts it looks like there is no easy fix. Putting electronic items near each other will also cause more EMI.
If I have my Guitar preamp on top of my Guitar poweramp I also get hum. Joke Nvidia should really work on this or marantz should work on their hdmi inputs. It all boils down to nvidia cards having their components so close together. If you use the nvidia output as the video output and the inbuilt igpu for Audio you still have the same issue and will probably lose hdcp 2.
Hopefully some physics professor will chip in and give us a safer solution. GibsonRed I registered on these forums to thank you so much for detailing all that you went through with this Nvidia noise problem with active speakers.
I too am experiencing something very similar and have been extremely perplexed and frustrated trawling through lots of online forums trying to figure out why it was happening and what solutions were being suggested. I knew that it was the video card under load that was causing the problem, but after faffing around changing cables, power sources, ferrite chokes etc nothing I did made any difference.
I will be trying the ground lift method and see if that helps. I've recently come across a post from someone called gunslingor on Toms Guide with thread entitled "High pitched static sound from speakers" Just thought I'd reference this in case it helps anyone stumbling across this thread.
Some people are also saying that AudioQuest Jitterbug could help too. Hopefully some combination of these will get rid of the accursed coil whine.
Thanks to all who have positively contributed to the thread. Looks like nvidia would have to step up to fix this issue. How nvidia thinks these noises are acceptable are beyond me. Surely someone would have tested this?!? I mentioned the humX and behringer hum destroyer earlier in the thread. I just lift the ground on the PC. Maybe nvidia should rebrand their gaming cards from GeForce to HumSource!
I get the impression that Nvidia don't really concern themselves with the "noisy interference" to sensitive audio equipment.
Buzzing sound from subwoofer (ground loop), what is the best solution?
Here are some methods to help you get rid of ground loops. Your receiver or amplifier already has a power supply with its own filters and transformers. No further filtering is normally required. If that eliminates the hum, you can install an inexpensive in-line ground isolators like this from Amazon. Note that these transformer-based ground isolators will work fine with analog cable-TV feeds, but depending on their design they may interfere with or block reception of HDTV signals via a digital cable or satellite dish feed. It may or may not make a difference. If you have a turntable, try connecting a separate ground wire to a chassis screw on your preamp or receiver and see if the hum disappears.
Subwoofer hum ground loop issue?
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Loud hum from subwoofer
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How to Eliminate the Hum From a Computer Audio Output
When the subwoofer stops delivering heavy bass and starts sounding more like the dog in the header image, something is going wrong. The good news first: It is probably a hum loop and is not due to a defective subwoofer. Ground loops and other external factors are often easy to fix. Is it clearly audible and dependent on the volume? Or is it clearly audible, but independent of the volume? There is an explanation for each of these three types of interference.
How to Fix Subwoofer Hum with No Input
You are not logged in. The subwoofer a self powered Bag End Infrasub 18 now has a noticeable hum. Not sure if the hum existed before, because I recently re-arranged the furniture. As a test, I moved the cable from the to the subwoofer so it would not be near any other speaker or power cables. But this did not eliminate the hum.
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So you just unboxed your new entertainment gear, hooked everything up, and you hear a buzz, whine, hiss, chatter, or any number of other annoying noises that have been known to plague audio equipment. You might even see some banding or waves on your TV. So you take it all back to the store, only to watch the salesperson plug it in and have everything work perfectly. What the…? Then again, it could be bad wiring, defective equipment, or just a noisy electronic environment. Note: Some noise is inherent, such as tape hiss, or hiss when you turn up the gain on an input.
If it does not download automatically, please click here. Lillian Lai. Is your speaker making buzzing sound? Many people have resolved the computer speakers buzzing issue with the solutions below. So before taking it to the repair store, read on….
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The answer to your question I found in google.com
did you have a headache today?
It does nothing useful. !!! SUCKS !!!
It seems to me that it has already been discussed, take advantage of the forum search.