JVC is similar IMO but w/ slower slightly bigger bass (maybe like 2000J w/ bass rings but I haven't used in a while). (the fdx1 version comes w/ pre-modded nozzles for adjusting the sound a bit, some say the bass is a little better too but I haven't tried).
Have not had 2000J for a few years, currently have FD01 and have not made direct comparison so I could be off the mark. I don't think they are exactly alike but they have some commonalities I think particularly in the midrange/treble balance , and differ most in the bass- as mentioned fd01 has a bit fuller midbass not quite the deep & very controlled subbass of unmodified 2000J (of IEMs I have tried 2000J is 2nd only to ex1000 for favorite bass). Unmodified FD01 is probably the closest to 2000J but personally I prefer it with the popular filter mod.
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