I believe it’s next to impossible to shield the 50hz or 60hz radiating from any power cord.
My Pangeas have no problem blocking 50-60hz …wonder if something is
not up to snuff with Vee’s set of Pangeas
…mine emit no noise…
Best wishes
@galen-gareis Please help us understand if and how 60hz AC can be shielded to reduce the impact to ‘close’ cables.
For some reason I’ve long believed that 60hz (or 50hz) is tough to ‘contain’.
‘So, doesn’t the shield keep all fields out of the cable? Not really. At very low frequencies — such as AC power at 50/60 Hz — the magnetic fields from a transformer or power line go right through nearly all shields because the material is not thick enough. (See the sidebar on shielding effectiveness.) Even a high quality coaxial cable shield is not enough. Just feed some low-level audio through a piece of coax laying on a power transformer to hear the induced hum. As the frequency gets higher, the shielding becomes more effective, as long as it is connected properly.’
Reference: Shielding and Shielded Cables | Nuts & Volts Magazine
When we get to AC feeds, or any cable for that matter, the geometry plays an integral part. Adding z-foil or copper shielding does little for us at 50Hz~60Hz and can actually increase capacitance which we really don’t want. There are materials that work specifically in the arena of quieting the electromagnetic fields and induction into items in close proximity and that is Mu-metal, and since it’s permeability values of 80,000–100,000 compared to several thousand for ordinary steel it becomes an ideal material if used correctly to assist. knowing the target frequencies we want to address is vital in choosing the correct solution. If we want to quell RF, then even the insulation can be used to assist, (which Galen’s testing of 19105, the cable used in the BAV power cable) shows us that RF can be addressed, even without outer z-foil or braid shielding. But at low frequencies, better to isolate cables proximity, and if required use barriers between AC and signal level cables, and leverage cable geometry, not unlike star-quad configurations. And for sure, never run AC and low voltage cables in the same raceway or track if at all possible, as it would more than likely violate code in your area, and certainly create a hazard in both noise and possible shock hazards.
All said and done my Pangeas are dead quiet…with no voltage detection along
the cables…if there is no voltage detection even in max sensitivity …
then how could 50-60hz be an issue…
Vee you might try a different power cord to you sub and see if that helps…
perhaps maybe a ground issue as well…
Best wishes friend
I have a magnetic field detector that detects fields from all my cables, including the Pangeas. The “hottest” cable is the one running to the P20, regardless of brand.
Is it me or are we confusing electrical signals with magnetic ones? I realize the two are tied together under the term electromagnetic but still they are different or am I missing the point?
Audio Sensibility Statement PC.
They’re inseparable. The EM fields are perpendicular to each other with the direction of the magnetic field determined by the flow of current via the right hand rule. If current is flowing from wall to component, point your thumb in the direction of the component along the cable and make a fist. Your fingers curl in the general direction of the magnetic field.
The testers we have likely use different methods to detect either field. The one I have is specifically made to detect magnetic fields and reads in microhenries.
So Vee if I would like to test for the magnetic fields of my
power cords…what does the tester look like and what is
the description…I may want to get one…
Thanks!!
Do we expect that a power cable should shield against magnetic fields? I think we agree that they should shield against radio frequency noise.
This is another area where I wish manufacturers provided measurements. They sometimes say that they reduce noise, but I don’t recall seeing any data that shows how much is rejected and at what frequencies. This would help to make informed buying decisions.
You can look on Amazon for an EMF Meter Magnetic Field Detector. They range from $20 upwards…
Thanks Barsley…they are all so different…don’t know what to select.
I use this one.
EMF Meter, Electromagnetic Field Radiation Detector 5HZ—3500MHz with 3 Levels Sound-Light Alarm, Digital LCD for Testing Ghost, Magnetic Field, Electric Field Radiation and Ambient Temperature - MET01 https://www.amazon.com/dp/B07TCFX8Y2/ref=cm_sw_r_cp_api_glt_fabc_YJ3YNJ06SQTHJ30SXTFR?_encoding=UTF8&psc=1
It’s good to know how far these fields extend to help position low power signal cables in tight situations.
Thanks Vee…
Just might get me one…
Me too.
Home made DHLabs 12AWG with Connex Rhodium connectors. Cost me about $100 CDN to make. Why spend more.
I bought the Pangea SE MK II cable to feed my P12. This is about 7 gauge, and I’m very happy with the result.
I am also using a Pangea 9SE MK II on my SP3.
P15 regenerator here. I went from stock to PS Audio AC-12 to Kimber P10 Palladian.