What mods do you have on your TH900?
Cups damping changed, the foam damper ring replaced to wool felt of appropriate density, make, thickness and diameters, the earpads stuffing replaced with carbon foam (and became more shallow).
http://www.head-fi.org/t/763965/fostex-th900-mods
Measurements included, but the subjective change big - they play in a different league now (as the local Audeze dealer said).
I haven't heard the Elear but I own the Utopia and if the Elear were anything like the Utopia in the mids department then it's pretty surprising that the TH900 mids are much better than Elear. I'd say mids aren't the strongest point on the TH900 unless it's on a super nice tube setup
I say there is more mids with the modded TH900 (sounds more open) and they are also better mids (sounds more transparent, more clear, and tonally sufficiently pleasing). The TH900 problems still persist: the 500 Hz notch, and another in the upper midrange. The Elear has a notch there too (check measurements on the other sites), and in addition it sounds more muddy. It really does. I point to the earpads as a culprit. I really wonder how the Elear would sound with the Utopia pads.
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As far as Utopia goes, I've spent a lot of time with it and besides the bass department they are in another league, as they should be at that price point. It is super suprising that you would have a hard time choosing between the TH900 and Utopia (ignoring price of course)
The hard time came from personal factors. The Utopia is not as good (for me) so that it could replace my Stax. Then, since I already have reference type headphones, my other wish is having a fun headphone (and closed at that). The Utopia is both reference and fun (except one thing), but the TH900 is much more fun, as it maintains bass energy an octave deeper with shattering bass, whereas the Utopia has a more neutral and reference type of bass, of which I already have better with Stax phones. In the mids the Utopia is better, of course, mainly because my TH900 is still colored - but it has a softer, yet very clear midrange. Overall though, the my (modded) TH900 kept up well with the Utopia - it did not really lose details, transparency, instruments ambience, anything, the Utopia was just more right with them. For the record, I tried with classical, instrumental, electronica, electric guitar + bass, etc and I am pretty sure about my testing methods.
The strength of the Utopia is the total package: it is nicely balanced, and truly reference quality, apart from that one thing, the hardness in the midrange (when compared to Stax), which is unfortunately a showstopper for me. I am too sensitive to that, perhaps. One could say it's the upstream electronics, but no, I know very well the beryllium sound from my former speakers, and it's the same type of hardness, it's a property of the driver and not the amps or sources. Of course, you can compensate that with sweet sounding tube amps and sources, and get to a very nice sounding total package, as I did with the speakers and c-j monoblocks, but still didn't solve the problem completely.