I would also wager that any guy walking off the street to hear your rig is not some trained listener and golden ear bat...Sounds like poor quality test subjects to me.
For what its worth, this poor quality subject has just acquired a Primaluna evo 400 preamp, and has been waiting for a ’decent’ XLR to plug it between the Weiss DAC and Marchand XM44. I didn’t want to spend too much just yet, so found what I think was the best $300 (Cdn) XLR I could find on Canuck Audio, it has an excellent reputation and retails for $500 US. I don’t want to name it. It showed up yesterday.
All connected, pre is used so well broken in etc, and after a few tracks not happy with the sound- sounds flat and lacks resolution. I expected a little warmth, but this preamp was reviewed to be a pretty good one- very transparent and "non-tube like". Oh well, my first foray into tubes is not a success, first thought is I’ll list it, but let’s just try a cable change: Swapped the $500 XLR with a $950 Acoustic Zen Matrix II, just swapped places between them, as the Matrix II is already in service from the Marchand to the lower channel amplifier. Huge increase in clarity and resolution. Easily a 10 second discernible difference. Dare I say night and day? Would I pass an ABX test? Absolutely. 100%. And this is with $2 a foot speaker cable substituted in on my bass panels as I have sent my Acoustic Zen cables in for re-termination.
Why aren’t other systems as transparent? Not entirely certain.