DIY Ground Box Thread

[diystereo]

The Oyaide NRF-005T is blocking or absorbing Mhz to Ghz frequency noise from being transferred through the cable. This Mhz to Ghz frequency noise smears/distorts the original signal enough that effects your gear's ability to fully read the original signal.

"Oyaide NRF-005T is a noise suppression tape using PULSHUT® (high performance non-woven textile) material developed by Asahi Kasei Corporation. This is a revolutionary material for suppressing electromagnetic noise and radiation generated by AV equipment and cables, allowing for more transparent sound reproduction." The secret sauce is PULSHUT. The patent is here, it says something about using non-magnetic materials.... but I dont have the technical knowledge to interpret it.

https://patents.google.com/patent/JP6846573B2/en

If you have any techflex or PET sleeving material on hand, here is a quick and easy experiment you can do. Not many people know about this. If you have a signal cable, slide the techflex over it and then listen again critically. The techflex or PET material will mix with dielectric of the cable and will smear the signal. Looks good, but bad for performance.

What dielectric insulation do you recommend for audio analog wire and what insulation material do you recommend for low voltage power 3.3v and 5v? I have choices of soft silicon, PTFE, and what they sell in the hardware store refered to THHN wire. For my headphones cable I went with silicon, because its flexible. But what would my headphone cable have better sound or worse with PTFE insulation, sacrificing comfort? And DC voltage as well?

Shunyata has been experimenting with quartz crystal inside cables for probably 2 decades and sells retail cables like this.

Im reading their "Technology" page now. Very interesting and want to investigate further.

 

[joscho]

Has the Oyaide NRF-005T ever been applied to ICs (integrated circuits)?

 

[cdacosta]

Has the Oyaide NRF-005T ever been applied to ICs (integrated circuits)?

Oyaide advertises to be used with IC’s. I have not fully tested this yet, but will.

 

[cdacosta]

"Oyaide NRF-005T is a noise suppression tape using PULSHUT® (high performance non-woven textile) material developed by Asahi Kasei Corporation. This is a revolutionary material for suppressing electromagnetic noise and radiation generated by AV equipment and cables, allowing for more transparent sound reproduction." The secret sauce is PULSHUT. The patent is here, it says something about using non-magnetic materials.... but I dont have the technical knowledge to interpret it.

https://patents.google.com/patent/JP6846573B2/en


What dielectric insulation do you recommend for audio analog wire and what insulation material do you recommend for low voltage power 3.3v and 5v? I have choices of soft silicon, PTFE, and what they sell in the hardware store refered to THHN wire. For my headphones cable I went with silicon, because its flexible. But what would my headphone cable have better sound or worse with PTFE insulation, sacrificing comfort? And DC voltage as well?


Im reading their "Technology" page now. Very interesting and want to investigate further.

For an outside jacket or sleeving, the least intrusive sonically is natural cotton. Best dielectric is air. If using bare conductors, use a larger PTFE or Teflon tube than the conductors like in that video you posted. Yes to the last two questions but the conductors and jacket material are only two parts of any cable design. Any wire will pass along electricity or a signal. I every part of the cable build will change the sonic performance and sonic signature when listening through a good to high end system. To build a really nice audio cable it is expensive. I now personally advocate to focus on lowering the noise floor of a system first, before getting deep into high end cables. Cables make a difference, but no where as much as lowering the noise floor.

 

[Ghoostknight]

oh good you mention chip tweaks.... i just did this :

imo shielding applied on top of chips is only good if you ground it
ungrounded shield will actually sound worse, where grounded it sounds better than stock
this also lines up with the crystal tweaks i was doing on top of the some chips.... ungrounded conductive material doesnt sound good here


top is the xmos chip where middle is the dac chip

 

[Jake2]

Thanks @cdacosta for your impressions of this stuff, your experience on the video front is quite persuasive.

They also make a large (L) A4 sheet version I was looking at back in June (can be craft knife cut to required size & shape) as well as the tape (T) version discussed in recent pages.

Really must get me some!

Hey has anyone tried this RF (MHz-GHz) suppression/absorbing material from Oyaide?

http://www.oyaide.com/en/products/emi_wave_absorbers/nrf-005l-edit

This is a newer A4 adhesive sheet version, there’s also a tape version that’s been available a couple of years.

It’s made from this non-woven, non-magnetic RF absorbing ‘Pulshut’ material by the materials division of Asahi KASEl corporation, Mitsui Chemicals Asahi Life Materials Co, a sort of mini-3M if you like. And yes their separate micro-devices division is a familiar name - AKM. Appreciate 3M has a range of similar RF absorbing materials (used IIRC by @kingoftown1 ), which like AK-MM, they appear to market primarily at electronics manufacturers.

More technical deets in English here including some quite cool RF emission heat maps of a circuit board before & after.
https://www.malifematerials.com/en/pulshut/

 

[Jake2]

Here’s the tests on RFI suppression of Pulshut /Oyaide NRF-005T/L I linked to previously. Particularly potent in the GHz range it seems.

https://www.malifematerials.com/en/pulshut/performance/

Screenshots added

 

[Jake2]

And YouTube before / after audio recording vids, these posts are from the AliX cables thread. Damn, I’d forgotten I’d even posted this.

Just worth clarifying that I’m referring to the newer non-magnetic suppressing version, the Oyaide NRT-005 (T for tape or L for large sheet I guess) vs the MWA-series one a couple of folk referred. Not sure of this but per the below when @dougms3 found the Oyaide tape he tried to have a negative too strong deadening effect it may have been with the OG MWA version. Oyaide claim the NRT version was developed specifically to avoid the audible effect of current dampening as a result of magnetic suppression this. I suspect (as do some folk on a forum that shan’t be named) it was actually developed by AK-MM to perform better with portable electronics with sensitive magnetic sensors for navigation etc. But hey if it works better for audio too, great.

https://www.head-fi.org/threads/aliexpress-cables.963919/post-17632431



Here’s a YT vid of the newer tape - doesn’t seem to be dampening dynamics and detail etc when applied to some analogue interconnect cables, quite the opposite to my ear, a more lilting sound with a longer note decay while the bass at the end is more weighty and textured.

Before (29s):


After (50s):

 

[diystereo]

Is Pulshut /Oyaide NRF-005T/L radically different / better (for audio analog/digital electrical) from these other manufactures?

Any experience with other manufactures that develop RF EMI absorbing sheets? On DigiKey found t-Global for $10. Others are Kemet, Laird, TDK, Wurth Elektronik, 3M and on AliExpress was this for $6.97:

https://www.aliexpress.us/item/2251...occ97R7gRqBoCNQoQAvD_BwE&gatewayAdapt=glo2usa

"Resistance to electromagnetic interference frequency range(10M-6GHz)
The electromagnetic wave absorbing film is an ultra-thin composite material having excellent absorption ability for high-frequency electromagnetic waves. The absorbing material is an ultra-thin composite film formed by physically refining and magnetic field forming a high magnetic permeability magnetic alloy and uniformly dispersing the same in a polymer.
Flexibility: can be repeatedly bent"

 

[Jake2]

Is Pulshut /Oyaide NRF-005T/L radically different / better (for audio analog/digital electrical) from these other manufactures?

Any experience with other manufactures that develop RF EMI absorbing sheets? On DigiKey found t-Global for $10. Others are Kemet, Laird, TDK, Wurth Elektronik, 3M and on AliExpress was this for $6.97:

https://www.aliexpress.us/item/2251...occ97R7gRqBoCNQoQAvD_BwE&gatewayAdapt=glo2usa

"Resistance to electromagnetic interference frequency range(10M-6GHz)
The electromagnetic wave absorbing film is an ultra-thin composite material having excellent absorption ability for high-frequency electromagnetic waves. The absorbing material is an ultra-thin composite film formed by physically refining and magnetic field forming a high magnetic permeability magnetic alloy and uniformly dispersing the same in a polymer.
Flexibility: can be repeatedly bent"

The one you linked to states high magnetic permeability so that is very different to the NRF-005 which is designed to have no magnetic effect.

More generally I’ve hardly read of anyone on these threads apart from @cdacosta using NRF-005 let alone comparing them head to head to other RFI shielding sheets like the 3M (which has a range of products aimed at different RFI spectra and use cases), so unless you can find direct comparisons elsewhere on the web, suspect any answer re relative audio effects would be speculation.

I just ordered a couple of sheets of the NRF-005L direct from here using a Japanese reshipper service for the first time, hopefully the shipping works out reasonable as per their calculator estimate. Will keep you posted.

https://shop.miyaji.co.jp/SHOP/ka-r-071723-at02.html

 

[Jake2]

@diystereo I should add thanks for the link, for magnetic shielding that material looks really interesting, its polymer form with flexibility to allow repeated bending especially.

 

[Ghoostknight]

i think you guys want to know this:

from Rife's research about PEMF :
2675Hz - "The Crystal Resonator". A subharmonic of the frequency of quartz crystal. "extremely effective for charging and clearing quartz crystals .. useful for clearing and balancing of their own energies. Some claim it energize crystals in the brain. Others say that it activates aspects of the auric field." (medium=sound/tuning fork) [JG]


Go play 2675Hz on your system and tell me this isnt (one of) the tones clear quartz produces.... its quite interesting how everything comes down to specific frequencys and seems to make sense "combined" ...

 

[Ghoostknight]

also the motor came today, really more of a prototype, i definitely need a new motor that is quieter..., i grabbed the first motor i could find just to test it out (before i got the fan idea yesterday)

but.... it works and at approx. 3-4x the speed of the fan (but also at 40-60db )

if you vary speed it almost has an effect as adjusting binaural beats up or down.... still amazed how strong the effect is (and it seems to last), im so far only using it occasionally to kinda get a sense for what it does exactly

if you dig into this imo this has definitely todo with "magnetic therapy", the spinning version does 5-10x the effect of the static one, which is still crazy to me

 

[dougms3]

The one you linked to states high magnetic permeability so that is very different to the NRF-005 which is designed to have no magnetic effect.

More generally I’ve hardly read of anyone on these threads apart from @cdacosta using NRF-005 let alone comparing them head to head to other RFI shielding sheets like the 3M (which has a range of products aimed at different RFI spectra and use cases), so unless you can find direct comparisons elsewhere on the web, suspect any answer re relative audio effects would be speculation.

I just ordered a couple of sheets of the NRF-005L direct from here using a Japanese reshipper service for the first time, hopefully the shipping works out reasonable as per their calculator estimate. Will keep you posted.

https://shop.miyaji.co.jp/SHOP/ka-r-071723-at02.html

This nrf-005 tape seems to be much different than the MWA-010T.

I think the mwa-010t is most likely some kind of sendust tape as are most of those clones on aliexpress and amazon.

The nrf-005 seems to be non magnetic and comprised of a different makeup.

 

[cdacosta]

Here’s the tests on RFI suppression of Pulshut /Oyaide NRF-005T/L I linked to previously. Particularly potent in the GHz range it seems.

https://www.malifematerials.com/en/pulshut/performance/

Screenshots added

I have seen the graphs. But for me to know what the tape (or any tweak or device) will or will not do in a particular application is to try it. For video works like a champ. For audio does offer positive gains but minor per application I have tried. Although the mild gains do accumulate to an appreciable gain.