An EXPERIMENT for those who have never heard differences in cables

Here is the truth of the matter. Wires act like antennae. Length, construction, metallurgy all vary their efficiency as a TX or RX.  The change in sound heard when changing the wire has nothing to do with resistance or ability to move a coil in a magnetic field. It's all to do with the DAC.
If you have a separate DAC, all that matters for maximum transparency is to keep away RFI/EMI ... conducted or transmitted ...from the final D/A stage. Because it's here ...where the bits become volts, that you can't have any perturbation of the clocking or reference voltage. If you don't appreciate this, you are playing whack-a-mole with cables.

So, I run Audiowise (www.audiowise.ca) and sell a 90dB+ sleeve that covers any cable (power esp). When a cable is not an antenna, the DAC is less affected and sounds it best.

Everyone has their pet theory as to why cables, or in this case a DAC, makes a difference. Lots of theories with no concrete proof other than the empirical, "I can hear the difference." You’ll have to tell me how a DAC makes a difference when I’m using a turn table, all of the connections are analog, and no D/A stages are involved.

The only way some are going to hear a difference with speaker cables, is to remove them from your system, and bring them to a home where differences can be heard on that system.

All of the cable changes I’ve made were done at my house with my system, since auditioning a cable at a store with their equipment has zero relevance as the cables are not connected to my system. Other than an audio store I know no one with a system better than mine, so I cannot avail myself of someone else’s equipment.  In any case, the audible difference on someone else's system is a moot point since I don't listen to their system.

Not all systems have the transparency and careful set up to hear what should be obvious. I do not understand why this battle goes on.

That very well could be true. In my system, I’ve used a Denon POA1500 amplifier, a McIntosh 2105, and I now have a Balanced Audio VK6200. I’ve used a variety of pre-amps, and currently have a McIntosh MK123 AV/pre-amp.

Speakers have been Klipsch, JBL, Magneplanars, and currently are B&W 802 series.

So, my systems have been solid mid-fi, but maybe not to the level required to actually be able to present the difference in cables.

Phono stage needs stable voltages for the small-signal to phono(line) level conversion. A turntable dictates the timing of the output waveform and needs mechanical isolation ...similar to a DAC needing ultra low noise to ensure the output clock is stable.

You haven't addressed a DAC affecting sound from a turntable.  Mechanical isolation is a completely separate issue.  Stable voltages have to do with the quality of the circuitry associated with the turntable preamp - and that's not a DAC - at least in my system.