As promised, here's the equalization for deep fitted Comply T-400 Small. RE-400 have the damper removed, but filter still in.
Sound is generally warmer and meatier, as typical with these foams. What's more interesting is that detailing is improved, equalization or not.
Subbass is like HE-500 w/ Jergpads, except slightly less impactful, yet thicker but just as fast. Bass decay is better, linearity is just as perfect after correction. Beats HE-500 and Paradox at timbre, except at highs. Ends at 17.5kHz with this equalization - I'd need way steeper highs adjustment. It is I think less dark than SE-5 unequalized - instead of sounding hard shelved, sounds relatively smoothly rolled off with a bit of shout/glare.
Reacts way better to equalization and keeps superior distortion handling. Ringing is vastly reduced compared to silicone tips.
More: Detailing easily beats Brainwavz B2 in direct comparison, whereas without foams it was comparable, with B2 being edgy and distorted, and RE-400 being too smooth. Now it's way less smoothed over. Sounds super dampened, akin to a studio or T50rp Paradox. Hard to describe space size because of this, but it's definitely not a free field.
The loss of definition due to shell ringing now sounds more like a bit of de-esser (or anti-sibilance) and is much more limited in range, whereas previously it was all over treble. Doesn't affect cymbals, guitars or trumpets for example.
The timbre is closest to HE-500 with Jergpads, but "more". Soundstaging is more coherent - possibly because the correction is easier and thus more precise. They're mercilless in exposing any kind of artifact (among them: lowpass, rolloffs, compression, clipping, MP3 dropouts, preecho) except minor amounts of sibilance.
EDIT: Precisely adjusted peaks and updated image. Even more detailed description. Removed silly idle speculation.
Nice and detailed review. I wanted to buy Vsonic VSD1 or Soundmagic E10 until I read your review for RE-400. I use my ipod classic and my music is jazz and electronic. So I need clarity, bass and good separation of instruments. I would like to hear your opinion. Thanks