I hope you found it. It only affected the sub and not the woofers on the mains eh?
Low level HUM, driving me CRAZY!
- Thread starter marpow
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I'm assuming, Markie, that your electrician installed DEDICATED plugs throughout for your system.....that no other extraneous electrical devices are causing interference?
With this one issue, interference between PC and Subwoofer (mains FL and FR dedicated subwoofer to those two channels only), problem solved, no more problems.
https://www.walmart.com/ip/10-Pcs-B...VoweICR2aRgW3EAAYAyAAEgIWM_D_BwE&gclsrc=aw.ds
Absolutely amazing you can buy these things from WalMart. No one mentioned them yet that I noticed. They may not help but won't hurt and may reduce the level if its interference pick up.
The post about transformer or capacitive ground loop breakers is probably what and where you will find the solution to your problem but I would not want any of these in my signal path permanently. Use them as a diagnostic tool.
This one is even called "Mpow"
https://www.amazon.com/Mpow-Ground-Isolator-Stereo-System/dp/B019393MV2
Did you have any luck grounding chasis together with a strand of wire?
Oh problem solved. Someone mentioned keys. You always find them the last place you look.
Absolutely amazing you can buy these things from WalMart. No one mentioned them yet that I noticed. They may not help but won't hurt and may reduce the level if its interference pick up.
The post about transformer or capacitive ground loop breakers is probably what and where you will find the solution to your problem but I would not want any of these in my signal path permanently. Use them as a diagnostic tool.
This one is even called "Mpow"
https://www.amazon.com/Mpow-Ground-Isolator-Stereo-System/dp/B019393MV2
Did you have any luck grounding chasis together with a strand of wire?
Oh problem solved. Someone mentioned keys. You always find them the last place you look.
audiomaster
Well-known Member
Most devices that use a "wall wart" type power supply (two prong plug) have no ground to "earth" and only a ground thru any interconnect cables to other connected devices. Sometimes adding a single conductor wire connected between chassis of these devices quiets them down also.
audiomaster
Well-known Member
Ferrite cores usually work at radio (RF) frequencies to filter it out of wiring. So the wire doesn't act like an antenna. Unless near a transmitter (or maybe cell phone) I wouldn't expect it to help with audio range noise.https://www.walmart.com/ip/10-Pcs-B...VoweICR2aRgW3EAAYAyAAEgIWM_D_BwE&gclsrc=aw.ds
Absolutely amazing you can buy these things from WalMart. No one mentioned them yet that I noticed. They may not help but won't hurt and may reduce the level if its interference pick up.
The post about transformer or capacitive ground loop breakers is probably what and where you will find the solution to your problem but I would not want any of these in my signal path permanently. Use them as a diagnostic tool.
This one is even called "Mpow"
https://www.amazon.com/Mpow-Ground-Isolator-Stereo-System/dp/B019393MV2
Did you have any luck grounding chasis together with a strand of wire?
Oh problem solved. Someone mentioned keys. You always find them the last place you look.
The spikes from 60 Hz modulated hash can be the source of noise. I don't think it would be a high probability but he has been thrashing this problem for a long time and I would try everything. As I said "they may not help but won't hurt". They are inexpensive and when I discard cabling that has them they always go into my junk box.
https://www.walmart.com/ip/10-Pcs-B...VoweICR2aRgW3EAAYAyAAEgIWM_D_BwE&gclsrc=aw.ds
Absolutely amazing you can buy these things from WalMart. No one mentioned them yet that I noticed. They may not help but won't hurt and may reduce the level if its interference pick up. I tried those a couple months ago, but a multi pack and put them everywhere including one at each end of my pre/pro power cable, did nothing anywhere at any combination.
The post about transformer or capacitive ground loop breakers is probably what and where you will find the solution to your problem but I would not want any of these in my signal path permanently. Use them as a diagnostic tool.
This one is even called "Mpow"
https://www.amazon.com/Mpow-Ground-Isolator-Stereo-System/dp/B019393MV2I see it but, where and how would it connect to?
Did you have any luck grounding chasis together with a strand of wire? Never tried, yet.
Oh problem solved. Someone mentioned keys. You always find them the last place you look.
I would be willing to bet that if you drill down into the instruction manuals of your amplifiers and your pre processors you are likely to find that they are using two different conventions for the wiring diagram of the XLRs three conductors.
A funny thing about "lifting the ground conductor at one end only" is it is exactly the opposite of grounding chasis s to together with a ground cable (which has solved problems for me in the past several times). The fact that switching to RCA solves the problem makes me think that the grounding schematics may be the problem. The + and - conductors and ground need to be mapped to the same numbers on both ends.
XLR is generally better than RCA but in most listening rooms with cable runs of twenty feet or less the difference won't be much, probably not audible.
A funny thing about "lifting the ground conductor at one end only" is it is exactly the opposite of grounding chasis s to together with a ground cable (which has solved problems for me in the past several times). The fact that switching to RCA solves the problem makes me think that the grounding schematics may be the problem. The + and - conductors and ground need to be mapped to the same numbers on both ends.
XLR is generally better than RCA but in most listening rooms with cable runs of twenty feet or less the difference won't be much, probably not audible.
Thanks everyone for your help. I have learned a lot and going to close this chapter. Still some things for me to investigate as to why RCA cables where the fix, but my problem has been solved.
I did swap out the cheater plug at PC and replaced with a HumX plug, a little safer I guess, plus it was just laying around doing nothing.
As I close this chapter, at least fo me, I have to laugh, the first bit of music I pick this morning is from the Joni Mitchell Archives Disc 4, Home Demo, oh my, listening to a 1960 something home mono recorder with tape hiss, you just can't win sometimes.
I did swap out the cheater plug at PC and replaced with a HumX plug, a little safer I guess, plus it was just laying around doing nothing.
As I close this chapter, at least fo me, I have to laugh, the first bit of music I pick this morning is from the Joni Mitchell Archives Disc 4, Home Demo, oh my, listening to a 1960 something home mono recorder with tape hiss, you just can't win sometimes.
Stuff like this makes me feel old.
I couldn't function without a meter, as basic and necessary as a philips screwdriver for me since I started my own toolbox after high school.
Is it like someone owning a nice bicycle and no tire pressure gauge?
Not a great example, except they're not expensive or difficult to learn on a basic go / no-go level.
More like a tach and dwell meter for tuning the distributor on a car?
Used to be necessary and common, now an antique curiosity for elderly hobbyists? 🏎
So what's the world coming to?
If there's no app for it on a smartphone, what use could it possibly be?
audiomaster
Well-known Member
You forgot the Timing Light! And the specific gravity tester for the battery electrolight! And the AM radio with the pushbuttons!
I got some ferrets from Woolworths.
They make a lot of noise when they chew on the lamp cords.
They make a lot of noise when they chew on the lamp cords.
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| Jensen VRD-1FF IsoMax Digital RF Isolator |
|---|
This worked for me. Here's a link to where one can be obtained. Markertek - Search Results for vrd-1ff Turned out to be a cheap solution for a perplexing problem.
Thanks for the clarification. I mis-spoke in my comment and my statement was not accurate. That's why I posted the links out to 2 other sources that explained things better than I. I was reacting to the implication that all studios/professional spaces lifted pin 1 on all cables regardless of whether there were noise/grounding issues present. It is only applies if one is dealing with noise/grounding issues. I failed to keep in mind the context of the discussion and reacted from a (my) false premise. My apologies to all.
It seems that I am yet another victim of the dreaded 'hum' scenario. Mine is a pulsing kind of hum. Fortunately, I was able to identify the source rather quickly.
I had problems Monday night when I turned on the TV to watch the Jets / Niners game. The TV was not 'seeing' the HDMI signal from the cable box. After futzing around for about 15 minutes, I simply unplugged both the TV and the cable box and then plugged them back in. That corrected the matter, but now there is this bloody hum.
Realizing the only thing that is different than before, I disconnected the HDMI cable between the cable box and the TV. Doing so stopped the hum completely. However, I've got to reconnect that HDMI cable each time I watch TV. Any thoughts as to why this simple common HDMI connection would cause such a problem?
I had problems Monday night when I turned on the TV to watch the Jets / Niners game. The TV was not 'seeing' the HDMI signal from the cable box. After futzing around for about 15 minutes, I simply unplugged both the TV and the cable box and then plugged them back in. That corrected the matter, but now there is this bloody hum.
Realizing the only thing that is different than before, I disconnected the HDMI cable between the cable box and the TV. Doing so stopped the hum completely. However, I've got to reconnect that HDMI cable each time I watch TV. Any thoughts as to why this simple common HDMI connection would cause such a problem?
quadsearcher
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Likely: The incoming cable into the cable box is not grounded well at the pole, or before it enters the house. Try with the RF cable disconnected from the cable box but have the HDMI connected between the cable box and TV,. If no hum, it is a cable ground problem. If still a hum it could be the cable box and/or also a ground problem.
I hate when those lamp cords are near the bulbs. Otherwise all I can hear is 101 The Fox KC.
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