Speaker Treatment To Resist Negative External Infuence

I have been trying some experimental work with high end audio lately. One of the problems is the electromagnetic interference from many sources outside the box with the audio signal once in the cabinet. I have pondered how to solve this and got to thinking about metal flake paint for this some time ago but just now testing the idea. So far the larger flakes seem to work best as they tend to lay flatter parallel to the speaker exterior surfaces. Smaller flakes did not do as good as they floated more and settled in random manner as the paint cured.
   Steel seems to work best at resisting inductance from things like power cords. Copper worked best for things like Blue Tooth problems and any other RF induced hysteresis  interference.

  I have tried radially coating the sides, top and bottom all in the same direction insofar as flake alignment and the back top to bottom. It seemed to mellow out high notes of stringed instruments and acoustic music where the string snap and even finger movement sound was audible for the first time and percussion was more vibrant and true to life. In general the definition of most music improved and sometime the difference was not subtle.
  The best combination was a 50 50 mix of copper and steel flakes at this time. As testing continues I may change my opinion here.
  I also tried a radial pattern on the sides,  top, bottom and back.  The "Faraday" paint would be applied with a brush beginning with the center of each side and brushed out radially. Now I would also apply more coats going in to the center for a progressively thicker layer as you approached the very center of each side. This yielded different effects and primarily seemed to benefit mid and lower frequencies. Cello resonance was profoundly stirring and pipe organs were like you were there. Jazz and Blues with five string bass notes in particular had better presence and the size of the sweet spot grew considerably.

  I never dreamed this would be the result that day I looked at some metal flake paint.