I have a LA4 preamp in my system and it is a solid performer, yet I am seeking to replace it as I think it is a little dry. However, to the point, I have been trialing “audiophile” balanced interconnects between my DAC, the LA4, and my amp. I had one set of Benchmark XLR’s and a set of Blue Jeans Belden’s, that I was replacing. I have tried two well known brands so far, both very different, and have one more set on deck. A friend with a very resolving system tried the same cables as I have, and independently, we have the an similar opinion of each set.
Yes, there is snake oil out there, but not all of it.