RE-400 should arrive here tomorrow. I can directly compare to RE-ZERO and Brainwavz B2, both in best configurations. (First: elliptic Samsung/Fostex ear tips M/S sized, filterless, equalized; Second: Comply P, equalized) And obviously I'll see if these get better when equalized. Didn't I say equalized enough? If no, then I'll provide the equalization curve. Any noticeably obvious mods will be applied too. I have RE-272 and RE0 relatively fresh in memory too. (less than two months; and have the eq curve for RE-272 stored) Of course I'll compare the RE-400 unequalized first to check if they actually need it or benefit much from it. (Much like B2 and SE-5 do and RE-ZERO in filterless config require.) Also for uneven matches: HE500 (yes, vs orthodynamic headphone, heh; same box) and SE-5 (vs $1300 custom IEM, which I'm not that fond of; also equalized).