You are obviously at a different level and I am not trying to discredit you guys.
The guy I was responding to and I are still newbs. And speaking with my own relative experience, it's hard to tell the difference with sub $300 DAC/amp set.
I currently have Modi+Crack and I can tell modest difference vs. connecting directly to motherboard soundcard.
Still got a long way to go :/
I am looking for upgrade to X-Sabre from Matrix... ><
Fair number of my upgrades have mostly been visible in hindsight.
My Ety's took my "earginity," that was a "Woah!" moment because of the level of detail and extension (yes) into bass compared to the then-standard earbuds. They were a revelation in pretty much every aspect. Since then, "woah!" moments have been harder to come by. The AD700 wow'd me with it's soundstage and pretty good comfort, so much air in those headphones. I went looking for an upgrade to imaging (difficult feat!) and a little more engaging headphone, I went to the Q701 and my first impression was that, for 2x the price, I could hear more bass and it had a different kind of comfort, but it didn't "wow" me right away.
I used the Q701 exclusively for about a week before trying the AD700 again... That's when I realized what I had gained. The Q701 was more balanced and closer to "natural," a dangerous word but "natural" doesn't stand out or excite but when I tried to go backwards it was obvious what I was missing out on, I had trained my ears and they were spoiled. I had both headphones for a few months because I wanted to save money and use the AD700 instead (it plays all the same notes at the same pitch!), but they rarely got head-time and eventually let them go.
For me, there's usually a few things that stand out right away, but I have to get used to a headphone on a broad spectrum of music to "learn it" and then A/B with an older piece of gear to calibrate my brain on how far the new gear has taken me and actually changed how I hear a song or game. One more fun example: I forget which headphone "revealed" it, but when I first heard Gnarls Barkley's "Crazy" on car stereo and my laptop speakers, I mostly heard the drum beats and the quick way he said each lyric, and my impression was of an energetic quick paced song... but better headphones revealed backing vocals slowly going "ooohWooooo ooohWOOOOOO..." which made the song much more somber-feeling, I go back to the cheap speakers and I can hear the vocals now that I know to listen for them, it doesn't sound as good/fun on the cheap speakers and I find myself missing hearing it on better headphones. I can't unhear what I've heard.
My "big" DAC upgrade was one of those hindsight upgrades, it didn't stand out by adding much in the way of new audio color or instruments I've never heard (well, a lot more of the ambient noises and spaces and suckling sounds stood out more than before with the cheap Turtle Beach DSS), what it did was clean and remove a lot of the crap cloying up the sound that previously my brain had accepted, ignored, and filled in with more vague stuff and low attention. The adjustment time with the new gear cleared out some of the old brain-burn-in, and then the immediate impression with the old gear and back to the new gear put the improvements in more stark relief and sealed the deal on the upgrade.