Stillpoint ERS EMI/RFI Suppression Cloth - snake oil or valid upgrade? - diyAudio
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Old 9th December 2006, 05:29 AM   #1
adhoc is offline adhoc  Australia
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Default Stillpoint ERS EMI/RFI Suppression Cloth - snake oil or valid upgrade?

Snake oil, or does it actually work?

How does something that is ungrounded 'dissipate' EMI/RFI? Or this work somewhat like a ferrite ring?

link - http://www.tweekgeek.com/product.asp...arch%26meta%3D
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Old 9th December 2006, 05:34 AM   #2
v-bro is offline v-bro  Netherlands
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The owner of 'artspeak' claims that cork tiles work just as well...
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Old 9th December 2006, 05:47 AM   #3
adhoc is offline adhoc  Australia
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Quote:
Originally posted by v-bro
The owner of 'artspeak' claims that cork tiles work just as well...
Now that is just ridiculous!
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Old 9th December 2006, 06:13 AM   #4
v-bro is offline v-bro  Netherlands
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I thought so too, but when I opened an amplifier (old pioneer preamp...) at a friends house who had a modification done by them it was sitting on top of all the circuitry, and a large piece just under the cover,.....
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Old 9th December 2006, 07:55 AM   #5
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How about using a metal plate and save your money?
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Old 9th December 2006, 09:00 AM   #6
djQUAN is offline djQUAN  Philippines
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Quote:
Originally posted by v-bro
I thought so too, but when I opened an amplifier (old pioneer preamp...) at a friends house who had a modification done by them it was sitting on top of all the circuitry, and a large piece just under the cover,.....

I guess the way it works is when you put it on top of your amp, the amp overheats and dies. so there you go. no more EMI.
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Old 9th December 2006, 09:17 AM   #7
adhoc is offline adhoc  Australia
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Quote:
Originally posted by Geek
How about using a metal plate and save your money?
Tricky grounding?
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Old 9th December 2006, 11:34 AM   #8
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Hi Adhoc,

It's clear to me that this material can only be of use for shielding susceptible devices from electromagnetic emitters in close proximity (ie in the near-field). For emitters in the far-field it will have virtually no effect. So you could use it to shield a DAC from a switchmode PSU sitting next to it, but not for shielding against mobile phones for example.

Near-field (or far-field) shielding is greatly improved by tying the shield to a reference (for example Earth) but there can be some shielding effect without it. Some energy can be dissipated within the material itself when unreferenced but the rest will be re-radiated depending on the material characteristics and its dimensions as well as the frequency of the impinging radiation.

Cheers, Ralph
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Old 9th December 2006, 05:08 PM   #9
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"this is all that we can claim, due to it's defense restrictions."

This sort of thing pins my BS meter full scale.

As long as there a numb-skulls in the world there will be products like this to separate them from their money.

I_F
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Old 13th December 2006, 05:04 AM   #10
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Default RAM...

The stuff is some RAM...Radar Absorption Materials, materials used for stealth stuff (Aircraft,ships,etc.) to absorb radar signatures , rarely seen stuff as it IS subject to DOD restrictions, hard to say how well it will work at lower frequencies however.
Iv'e heard about the stuff but haven't seen it for sale..perhaps this is one of the few markets where it is 'useable'.
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