Just taking a break on something and decided to compare the FXD-80 to the RE-400. First, surprisingly the FXD80 is somewhat bigger and definitely heavier than the RE-400. Yet, I love the FXD80 sound signature and those cnt are something else with a good burn-in (I'm easy over 100 hours). So, first thing, the FXD80 has more bass than the RE-400 (although not significantly more). ........... And ..................
That's it! The RE-400 simply DESTROYED the FXD80 ....Yes, destroyed it! I couldn't believe it! lol .. This RE-400 left the FXD80 sounding muddy and unrefined (never thought those two things about the FXD80 before). I played both at same volume setting through the Fiio E10/E9 combo. The RE-400 just take vocals to one of the most natural sounding spheres I'ver ever heard. But beyond that, the RE-400 just cuts through the sound (as someone else else once state) like a surgeon, just pulling out every detail in the notes and the way the instruments are struck, plucked, banged, blown or strummed. It's the champ in clarity, transparency and natural timbre (and even weight of notes). Since I don't own the ASG-2 now, I have to say that the RE-400 and H-200 are the two best universals I own right now! Yes, even beating the great sound CKS1000 in sound quality. I don't know what's holding you guys back, but you're depriving yourself by not hearing this earphone. This earphone shows what $100 bucks can truly get you in sound. It sounds like a $300 or better earphone to me. I would put its refinement on EX1000 level without those awful harsh highs. I actually think it has better bass than the EX1000 or EX600. Okay, stepping off of the soapbox. By the way, I'm not really a Hifiman fan. While I think the build quality is just get enough if you take reasonable care of the earphone, it could be a lot better (the FXD80 is a tank in comparison to build quality of the RE-400). But at $100, I really don't think anything I've heard at that price level (even when the TF10 is sold at $100) can stand shoulder to shoulder to it. It's the clear champ at $100 in my humble opinion.
RE-400 are the cheapest with 8.9 SQ or higher on the headphone list. He gave the FXD80 8.7 SQ. Too bad he hasn't reviewed the Carbo Basso or Tenore.