[konut]

I saw this recently
http://techdigest.tv/2007/04/wifi_blocking_p.html
It occured to me that this might be an effective, and cheaper, solution than some of the existing shielding systems available now. I called the company and spoke with VP Pete Hernandez. He informed me that they had tested this product and that it blocks signals from 30mhz to 18ghz and had not tested below those frequencies. He also stated that to be effective a coating of only 2-3 mil was needed. Current cost was $600 a gallon. More tech specs here.
 http://emsectechnologies.com/collateral.php
When asked, he stated that no audio companies had expressed an interest in this product. I just don't know enough about the tech side of things to know if this is even worth investigating. I'm sure the community here will let me know. TIA

[rollo]

Great idea but at $600 per gallon it is cost prohibitive as compared to conventional methods.

 rollo

[konut]

If you sprayed it, at 2-3 mil, a gallon would go quite a long way, especially given the dimentions of most audio chassis.

[art]

There are easier ways to keep out crud above 30 MHz than to spend $600/gallon. At least when it comes to practical audio gear.

Pat

[Audiovista]

The paint could help with some Class D amplifiers and equipment using switching power supplies. Mainly to prevent them from polluting the environment and to increase margins of compliance with FCC and CE requirements.

It is intended to be used in addition to the RFI filtering.

Boris

[NotoriousBIG_PJ]

You can buy super shield conductive spray paint for 30 bucks. Works great for shielding plastic audio cases.

Biggie.

[konut]

A brief Google yielded this  http://www.lessemf.com/paint.html 
Some of these are more effective, costly, and wider ranging(as far as frequency) than others. The thrust of my original post was to inquire if that particular product was of use in providing protection from rfi and emi and to stimulate discussion as to which frequencies we should be concerned about and how much attenuation was necessary.   

[art]

A shielded enclosure is usually sufficient. Some of those coatings have absorbing materials, which add to their effectiveness.

What none of those coatings are able to address is conducted EMI or absorbed RFI that enters through the cables entering/leaving the chassis. Class D amps (as mentioned above) radiate most of their crud on the speaker cables, with some also on the power cord. The interconnects usually are not a major source. Unless the coating has absorptive properties, they will not be of much help. At least not in relation to a decent metal enclosure.

(Of course, there are coatings that have copper, which is more effective than aluminum. That could also be accomplished by plating. Usually less expensive than $660/gal.)

Pat