I’ve added a photo of my racks so you can see what I’ve done. Basically I’ve lined the racks with aluminum foil, then draped an aluminum foil tent over the power distribution center where all the power cords group together. Time will tell...
high frequency intermittent noise
I have a noise issue that is intermittent. Here is what the noise sounds like:
https://clyp.it/4b233bmm
Here is what I know so far:
https://clyp.it/4b233bmm
Here is what I know so far:
- The sound affects all components and is compounded if all components are turned on. I have turned off my preamp, phono preamp, leaving just my mono blocks on, and the noise still appears.
- I have turned off everything and unplugged everything in the house including my dimmer switch, and the noise still appears.
- I have a pair of pro-audio monitors, self powered with class AB amps, and when I plug those into the same outlet, I hear the same noise coming through the pro-audio monitor. So this rules out my big system.
- The noise is primarily during the day and goes into the evenings, weekends too, early mornings it does not appear.
- I live in a pre-war mid-rise building. I have no ground, I'm using a Nordost QKore grounding system. This did reduce the noise floor quite a bit, but has no affect on this intermittent noise.
- I have a cell phone tower directly across the street from my building in Manhattan.
- Looking at a real time analyzer, I see peak at 2kHz when the noise appears.
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- 157 posts total
Consider snap-on ferrite beads. Relatively cheap. Worth at least experimenting on interconnects and power cords. http://amzn.to/2hLhLG9 Best, E |
@james1969, I missed the Big Glass Window directly behind your audio gear when looking at your system pictures before. Just a test you can try, if you are up to it. Cover the entire window with at least two layers of aluminum foil. Tape the foil in place. Overlap all splices by at least a couple of inches. Overlap the second layer by 1/2 the width of the aluminum foil. If possible wrap the foil over the window inside trim to the adjacent wall, window sill, and above window trim. Ground the aluminum shield to the mains equipment ground with a piece of wire. For the ground connection of the wire to the aluminum foil you could try removing the insulation from the wire several inches and then tape the bare ground wire to the foil the entire bared length. If by chance it works, fingers crossed, you might then try copper window screening to cover the glass window. EDIT: If you do try the experiment, experiment with the foil shield grounded and un-grounded to the mains equipment ground. Example of copper screening. https://www.dkhardware.com/bronze-copper-zinc-60-screen-wire-50-BRZW60-product-49932.html?gclid=EAIa... almarg and or kosst_amojan, or others, Would the copper screening work well as a shield and reject RFI from entering through the glass window? |
- 157 posts total