I see. Is the IM04 really bassy though. I don't like a lot of bass. The signature that i'm looking for in my new pair of iem are good clarity, detail, instrument seperation, mid forward with airy vocals (Like sitting in the first row of a concert), big soundstage, neutral bass, treble with some sparkle and good extension but never harsh/sibilant.
Music that I listen to are rock, metal, female vocals, post rock, math rock, shoegaze, punk rock, experimental, jazz, classical, instrumental, pop, r'n'b, and a ittle bit of hip hop and rap. Just to give you some idea of my preferences.
EDIT: It's amazing that you stated the IM04 performs technically in the same level as the Parterres which is quite a bit more expensive.
What else have you used in the past? The IM04, even though it has more bass than what I'd personally want, isn't really a "bassy" earphone. It has good bass extension, but the bass isn't overwhelming, and it possesses a lot of natural transparency due to nicely accurate mids. If I had to take a guess (likely not really that accurate), the bass response is about +7.5 dB above Ety-flat. I don't think you'd be disappointed at all --- keep in mind that I probably have higher standards for clarity and transparency than probably more so than 99% of head-fiers.
Yes, The IM04 and the Parterre are on a technical level, similar. I think most people, even those with loads of TOTL CIEMs, would be quite impressed by the IM04.