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I recently purchased these for home use and I simply do not like them. They seems a bit bass heavy with tamed highs to me and its really not my thing. I do see why these are very good for the price if you enjoy the darker sound, but to me they just come off as hidden and un detailed in a way.
I, too, thought the 203 is a bit bass heavy with tamed highs. I tried the remove the liners mod, and there is a noticeable difference. The highs no longer blend into the upper mids, and it no longer sounds like you are listening through a veil. (Which you were. literally.)
I think "pleasant treble" is a good description of how they are stock. This might explain why multiple people have said, unlike other headphones, they can listen with these for extended periods of time with good volume and not get tired or a headache. Removing the liners makes everything a little more "immediate," and the highs are more... high, and clear. I find myself listening at a slightly lower volume now than before -- not because the highs are overpowering, but I think maybe because before I was turning the volume up because the highs were missing and I was trying to hear them. If that makes sense.
I think I also turned the volume up because, without high highs, I could. ...There's that "pleasant sound" coming into play again. Though, when I first got them, the bass was too much for me; too much bass is unpleasant, and I turned it down on the EQ. Somewhere along the way, I stopped doing that.
No liners pushing the highs into the upper mids also means the upper mids aren't as thick and rich and warm, like I was trying to describe. I think Meder nailed it with the comment, "Im not hearing my music the way it was meant to be heard in short is how i feel." With liners, it's a pleasant sound, but the tamed highs made me think I was missing out on something that should be there. I don't know if people would agree they sound better without liners, I'm not even fully sure if I agree with that other than for clarity,
but I think they sound more true. And, highs vs. tamed highs aside, it's hard to give the clarity back.
Make sure you pop the plastic "plate" back onto the cup fully if you take the liners off of them. I had both on with only one of the two (four?) "snaps" on each side popped back in, so the plate wasn't fully seated over that white paper, and they definitely didn't sound right. Lost a lot of bass and fullness.
The HD203 is notorious for physically crushing people's heads. These certainly hurt my ears when I got them. Somewhere around the 20-30 hour mark they stopped crushing my head. I don't know if the headband stretched a little or if the pads lost a little puffiness or what.
I was considering getting a pair of Superlux 661 (which apparently sound similar or better than Sony V6 and 7506), RX700, or Incipio F38/FA-004 to try to get a bit more highs (and perhaps a little punchier bass), but no liners on the 203s have lowered the priority on that. If anyone has 203s and any of those, I'd love to hear comparisons. Also considering JVC HA-S400 for not much reason other than apparently they sound really good, but it'd be nice to hear how they compare to 203 if you have them.