02-06-2008, 06:10 PM
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#284 (permalink)
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Headphoneus Supremus
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Originally Posted by dvw
Try Google Faraday Cage, and EMI ferrite. Aluminum foil are non-magnetic. So what you have constructed is a Faraday cage. However for a Farady cage to operate properly, the shield needed to be grounded.
The magnet used on the cable is to reduce emission. It is also used in some power supply cable to reduce emission from the switching power supply. These are part of the FCC requirement.
One of the great test for RFI/EMI is to use your cell phone. Just call someone and the put your phone along the cable, connectors and equipment. The interference will sound like a noise, not reduced high or low. It is very distinctive. If you don't hear anything different, then you don't have any problem.
You can do the same test with cheap powered PC speaker. You can definitely hear a noise coming through.
Very cool. Thanks.  I will try some of those tests.
__________________
____________________________________________ Headphones → Denon AH-D5000 (modded)
Amp/DAC → Meier Audio Corda Opera :::
Transport → ESI Juli@ ::: Vista → Foobar 0.9.5 → EAC extracted PCM → ASIO 2.0 → SSRC@96/Ultra → ESI Juli@ → S/PDIF :::
Power → Virtual Dynamics Master LE 2.0 Power Cord (Amp/DAC) ::: Cobalt Cable Ultimate Power Cord (PC) ::: API PowerWedge I
Interconnects → Virtual Dynamics Master LE 2.0 Digital IC ::: Cobalt Cable Ultimate Digital Coax
:::::::::::::::::: Cobalt Cable Ultimate Audio Interconnect Pair ::: ALO 6" iPod LOD ::: Qables 15" Silvercab iPod LOD
Portable Source → iPod Classic (6g) 80gig, with Agent18 Hardshell Acrylic Case:::
Accessories → Audio Technica AT-HPS500 Headphone Stand ::: Woo Audio Silver Headphone Stand
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