New Omega E Mat from Perfect Path Technologies


Many of you own or have read of the highly-regarded PPT Omega E Mat, one of Tim Mrock’s revolutionary signal-enhancing accessories. Just prior to his untimely passing, Tim had finished developing a new generation of his Omega mat, soon to be available. Krissy Mrock has asked a few of us to introduce this new mat, here given the working title of The Double Omega.

In distinguishing the Double Omega, we know the original Omega, herein called the single, as a 7.5” by 10”, rather heavy and somewhat pliable mat, a bit more than 1/8” thick and with a vinyl-like feel. One face is glossy white, displaying the PPT logo and Omega name, while the other is black, smooth and magnetized. Sandwiched between these faces is the active material that causes components to reject the EMI that saturates everything in our surroundings. The Double Omega is much the same, with one important difference: the magnetized face has the finely-textured feel of around, say, 220-grit sandpaper. This texture, it is presumed, comprises yet a second active layer of EMI rejection. Presumed—because working details of the Double Omega are not well understood—better yet to know how to apply it.

With the understanding that the single Omega E mats generate field effects from both faces, mats have typically been placed under and over components and vertically over circuit breakers. How you apply the Double Omega will depend on best use and experimentation. In my case, I have removed two single mats, lying side-by-side, from the top of my large Wadia CDP and have replaced those with two Double Omegas. The Wadia is a one-box player that contains a pre-amp, so I wanted that second, strong field effect exerting downward as well as upward. I also have several singles placed underneath, just as before. Going straight to amps, this player is my only source, so I want it fully protected from EMI. Your priorities will differ.

As of this writing, I am only thirty-hours in on placing these Double Omegas, and I can already tell you they are powerful in their prevention of EMI within my digital source. Yet another veil has been lifted—all instruments and voices are even more sorted out in the aural space with new information heard within that space. There is much more decay heard against a new silence behind and between the musicians. I am already so pleased and excited about what the Double Omega E mats are doing. As Krissy told me, Tim was really stoked to have these new mats available. Rather than wait for the the fourteen-day window of improvement, I want to get this intro out so others can relay their experiences sooner.


128x128jafreeman
mu metal has high permeability so it saturates easily in the presence of a magnetic field, i.e., it ABSORBS. But at the same time, mu metal SHIELDS the surrounding electronics and wiring from the magnetic field, in the simple case of a transformer in an amplifier or BLU RAY player. It’s two! Two mints in one! 👯‍♂️
GK,

Best to read the whole Wikipedia article before posting, it will prevent you from posting things that are wrong, and for the record, once again I am Proving You Wrong.


  1. The fact it "saturates" has nothing to do with the shielding. It has only to do with permeability
  2. Know what happens when it saturates? ... it stops working as a "shield". That is why Mu Metal is often used as a secondary shield when high magnetic fields are present.
  3. It is natural to assume that a Magnetic Shield does exactly what it say’s and acts as a shield deterring the magnetic field away from the protected area. In essence a Magnetic Shield does exactly the opposite, acting as a “sponge” drawing the magnetic field in. It is here that the clever bit happens – the magnetic field is now directed along the path of the shield, bypassing the protected area inside. This allows the field to circle around our protected area before continuing its journey once it leaves the opposing side of the shield. Providing the magnetic field is lower than the saturation of mu-metal (0.76 Tesla) the protected area remains free of spurious magnetic field. Once this level of saturation is reached and exceeded, leakage of the field into the protected area will once again occur.  (Hint, that means it is conducting the magnetic field)  From: mumetal.co.uk
  4. A high-permeability material such as mu-metal or its derivatives can give LF magnetic shielding by concentrating the field within the bulk of the material, but this is a different mechanism to that discussed above, and it is normally only viable for sensitive (or noisy) individual components such as transformers.  (Again, conducting the magnetic field)  From: EMC for Product Designers (Fifth Edition)
  5. https://www.mushield.com/magnetic-shielding/how-magnetic-shielding-works/
  6. PASSIVE SHIELDINGThere are two mechanisms for magnetic shielding:eddy-current cancellation, which occurs in materials with highelectrical conductivities andflux shunting, which occurs inmaterials with high magnetic permeabilities [7]. Flux shunt-ing is an effective mechanism for shielding static magneticfields and eddy-current cancellation is effective for time-varying magnetic fields. (MuMetal uses flux shunting. Flux shunting -- meaning conducting the magnetic field or shunting it). From a paper on CERN: https://groups.physics.ox.ac.uk/font/papers/IPAC19/ipac19-mopgw082_paper.pdf
  7. MuMetal only works well till 10’s of KHz.
  8. This showing you to be wrong is a full time job.
  9. It is nice to know you are learning something from me.
  10. No mints for you.



geoffkait18,553 posts11-27-2019 11:41ammu metal has high permeability so it saturates easily in the presence of a magnetic field, i.e., it ABSORBS. But at the same time, mu metal SHIELDS the surrounding electronics and wiring from the magnetic field, in the simple case of a transformer in an amplifier or BLU RAY player. It’s two! Two mints in one! 👯‍♂️

I don’t have to consult Wikipedia like you obviously do. I am obviously referring to audio applications of my metal. Duh! That would be low frequency 60 Hz high permeability Mu-metal and high frequency high permeability mu metal for speaker diaphragms. 

Knowledge is what’s left after you forgot all that expensive stuff you learned in school. 😀
GK,   I figured you would come back with some obtuse and irrelevant deflection to attempt to prove you were not wrong, but you disappoint even me with this attempt.  There is no "60Hz" mumetal (generic, not the brand specific version), any more than there is a "high frequency" mumetal, both of high permeability. Higher permeability alloys are not good at high frequencies and anything that purports to be mumetal is not much use past 100KHz and rolls off well before that. Similarly, all of them work just fine with low frequency fields like 60Hz.

Oh, and GK, none of that does anything to negate that again you were wrong about how mumetal works. Maybe because of that you have been using it all wrong?

Glupson, you were right, you win the bet.