LS shall abbreviate Loud Speaker:; the baseline LS cable I purchased in mid 90s in an electronic super market the sort of Best Buy. I believe it was called Eagle Cable (a German brand), with many relatively fine litz copper wires packed in 2 poles of apprx 4mm², which were enclosed in darkish semitransparent gummy isolator material (PVC supposedly), spaced apart by a few mm (say 8?). We are talking about mid ninetees. It was ok, given the price of the equivalent of 50 euros for like 5m pair, terminated with cheap screwable banana plugs (also a topic in itself, though not for this site, I understand).
Re A/B comparison: I understand it is widespread to quickly switch back and forth A->B --> A etc, because allegedly its all in the short term memory and longterm memory is not reliable or doesn't exist.
I have done that (quick switching) with DACs where its easy to do, but generally, I feel it leads to much more reliable results to switch back/forth in waaay longer intervals and listen repeatedly to a bunch of selected songs for months. Switching then from A to B puts me in the situation that everything sounds to some extent different (if it actually does): plucked bass plops different, strings are smother or not, the room is flatter or more 3d, instruments hang in the room or in the speaker, the voices are more real or not, and so forth.. meaning, my personal musical short term memory does not nearly work detailed as the long term memory built up over months. Perhaps this is the root cause for me hearing differences, and notably so, where others do not? Also it is definitly not practical to operate along this procedure with a selected qualified listening panel (blinded or not). Anyway, after listening to B for a while (days..) or again A, I usually also become aware about my overall listening pleasure: do I want to spend more time listening than before, or is it even less, because it doesn't touch, startle, kick me, get me to dance?? So, it is quite a bit more holistic, then the ubiquitous 5s A--> B--> A. And, unavoidably, more subjective, but inline with the person that pays for it. What remains, however, is to conclude whether A or B was better, more often than not it is a somewhat mixed bag..
Now before this triggers someone here again, because it violates strict industrial standards of evaluation which everyone follows here (remember my comment re applicability in connection with qualified blind listening panel) I understand you all do it different. Or not at all. I am an amateur, not an EE-engineer busy developing a product. I leave it some time. Perhaps you find it worth to try it this way once and see how it goes?
cheers