I’ve owned a few IEMs over the years, but I was never that crazy about their sound because I was comparing them to full size open backs, an amateur move really now that I look back on it, lol.
But regardless, here is my IEM progression:
Klipsch X10 - First real IEMs I got, I really liked them for the warmth and comfort. But I could not ignore the lack of treble sparkle and what I now understand was the “BA timbre”.
Klipsch X20i - Unsurprisingly, I wanted to go with a familiar brand but more high end. However, I was really disappointed with the X20i, as I could hear audible distortion in the upper mids and they actually sounded worse than the X10 to my ears.
Hifiman RE-400 - This is when I discovered I much prefer dynamic driver IEMs to balanced armature ones. RE-400 was a little shouty around 2 kHz, but they had a much better treble texture and bass quality compared to the Klipsch IEMs. With EQ, these were my go to IEMs for years. I still have them.
Meze 12 Classics - Got these for free on a Head-Fi review tour, I really liked them at the time because of the great bass impact and sparkly treble. But listening to them now, they really don’t sound impressive in comparison to modern IEMs.
Etymotic ER2SE + ER2XR - Got both of them to compare, I preferred the ER2SE for the extra treble sparkle. Really super detailed in the mids and treble, I often use these with EQ to make it warmer.
Sony MH755 - These completely blew me away, and I prefer them to the Etymotics! I can’t believe it costs so little, I got a legit pair for $10 last year. If you had told me they were $100, I would believe you because they sound like that much. Excellent neutral midrange and treble, with extra sub bass kick to make everything engaging.
JVC HA-FDX1 - The hype is real with the FDX1, and they are probably my endgame IEM. I often compare them to full size open back headphones, and I prefer the FDX1 to some of them which is ridiculous. They have incredible bass dynamics and texture that reminds me of the Focal Elex, they have better treble resolution than anything portable I’ve heard. Only complaint is an emphasis at 4kHz which can add some harshness. But with some EQ and the blue middle damping filter, I have trouble going back to any of the other IEMs I own.