There is absolutely nothing wrong with shielding IF done correclty. The distance between the shielding and the conductors can be augmented to ones specifications. That's if you know what you are doing. The cables I use have the shielding spaced a calculated distance away from the conductors. Also, the shielding itself can be increased or decreased in thickness depending on how your equipment is configured regarding the cabling. Do you want to see how effective your cables are at keeping EMI out? Wrap some power cords around the length of the cable and tie them around the cable. Its not a practicle scenario...but for experimentation sake it is. I you hear anything...then you may have issues regarding environmental polution. If you dont...you system is free from any EMI anomylies. RFI hardly is an issue. Its very rare to have issues with RFI. EMI from power supplies is usually limited due to shileding by the component. If engineered properly. Email me if you like for more info regarding interconnects and the science behind them.
