Are anti-cable interconnects properly shielded?

Shielding is a band aid. Sometimes it is necessary.

Back in the 1950's I built the Heathkit (Mono) preamp. It had extensive shielding of its internal wires. Still it humed.

Next I build the original Dyna Kit (Mono) preamp. Absolutely no shielded wire. Dead silemt.

Circuit design is the key.

Keep in mind that the shield of an unbalanced interconnect not only reduces emi/rfi pickup, but must provide a connection path that is as low impedance as possible, in order to minimize pickup of low frequency hum and high frequency buzz due to common impedance coupling from ground loops that may be present to some degree. And that requirement is generally much more important than shielding against airborne pickup, as explained in this paper:

http://www.jensen-transformers.com/an/an004.pdf

The coiled construction of the return conductor of the Anti-Cables interconnects leads me to wonder if their impedance at high frequencies, due to the resulting inductance, may lead to unacceptable ground loop problems in some setups. Particularly if the cables connect components that are plugged into separate dedicated ac lines, or ac outlets that are independently filtered by power conditioners, and particularly if high frequency distortion components (such as may be caused by dimmer switches, for example) are present on the ac line.

Regards,
-- Al

Be sure to keep your Speltz ICs separate from each other. I have found they can talk to each other, or cancel one or the other out.

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.

Thank you for all of your answers! Great information which I will mull over and consider as I move forward in tweaking my system.