I had a similar experience. Never had these demod to me in the past unfortunately so I don't know what they should sound like, but I know I'm not getting the full experience. Bass especially seems lacking unless I change EQ, but nothing like what everyone else is describing. I'm almost 99% sure it's all about the amp.. So I'm thinking either a Jotunheim or maybe something more affordable that won't lack the full sound.
Don't be to quick to blame the amp and its not always about the watts output either. Some amps and headphones just go together better than others. It could also be your previous headphone was bass heavy so it might seem like it lacks bass or if you are coming from a bright headphone like a Beyer or Grado the LCD-2 might seem dull. Another thing to remember is that the sound signature of the LCD-2 has changed over time from being warm to closer to neutral.
What is mainstream pop? Isn't that what "Beats" are made for? j/k...
I actually really like this song and play it on all my gear to test out the lows. It isn't an "impactful" low, but a deep one from a guitar. I also like his voice.
https://youtu.be/Q3UNJorPbKg
Sounds a lot better on my Nhoord driver build, a little lifeless with the LCD-2 to me.