Unplugging / replugging Anti Cables Changes things

When you say you "moved the amp 6-inches sideways to make some room," does that mean you put some other component right next to the amp? If so, that could be your problem.

I have some Anti-Cables and have plugged and unplugged them a bunch of times and never noticed a difference in sound quality...

Perhaps you were out of phase before and now have got it right. Out of phase will have a more airy sound which you might call sumptuous. In phase is generally more of a solid sound.

Thanks for the responses.
Shadone: the stiffness of the Anti-Cable speaker wires would prevent me from having an accidental phase shift of the terminals at the amp end. I don't think I have accidentally phase shifted my terminals at the emp end. I did not touch the speaker end at all. Given what you said about sumptuous sound with deliberate phase change, I will deliberately try it.

Plato: I did not put any new instruments next to my amp. I made room for my CD collection next to the amp. I since moved the amp back to its original position.

Mlsstl: After over 25 hrs of reconnecting, the sound has still not come back to the original broken in sound of the Anti Cables.

Since Anti Cables are not shielded, I would explore the changed EMF/RFI theory. Are the cables crossing over other cables now? Exposed to the rear of another component? In closer proximity to a power cable than they were? I would look at your overall physical layout of cables, components, power conditioners etc. and look for potential problem spots. I don't think Anti Cables would be my first choice if the cable environment in the back of my set up were particularly tightly packed with boxes and wires.

If you've changed ANYTHING else, I'd look there first... If you haven't changed anything else, two possibilities exist: 1) You're imagining the change in sound, or 2) The performance of one of the components in your audio chain is deteriorating.

In the case of #1, I simply suggest that you imagine it sounds like it used to; and for #2 (that will be more difficult to track down), but if you use any tube gear maybe a tube or tubes are showing signs of aging/deterioration.

I highly doubt that what you described is the result of plugging and unplugging cables... Normally, a system sounds better after cables are unplugged and then plugged back in (at least in my experience).