Twisted pairs are used all the time. It's a technique that helps shield conductors, used by many manufacturers. By the way, that's the digital in wires.
Hard to tell from the web site image -- do AVA DACs use a pulse transformer (PT) on the input? Even if this were the case, the transport would
also have to use a PT on the output for twisted pair (TP) to be efficacious. In other words, only use TP when the S/PDIF input uses isolated grounds (i.e. balanced). TP with single-ended connections (i.e. when transport ground is connected to DAC ground via the "negative" side of the RCA cable -- which is what most transport/DAC combos do) spews shortwaves. And this situation
inside the DAC's metal chassis affects sensitive digital circuits. For
balanced circuits, TP is probably better.
This page shows correct use of both types: one balanced TP on the far left and regular SE RCA inputs and an output.
Quick fix for single-ended S/PDIF:
- Unbraid the TP.
- Wrap Al or Cu foil around each wire's insulator (the rubber/plastic part ONLY), and ground the foil to chassis.
-Further EMI/RF-improving tweaks may be realized by placing small strips of Cu or Al foil on top of ICs, and grounding it.
