I recieved and soldered my Smabat M2 Pro kit yersterday. I got it for 30$, which I think is reasonable, and I like the idea of paying less for a kit (that said I could have done without the USB soldering iron, it's pure waste). I had the basic titanium coated driver and only one type of tuning mudule (type 0).
Here is a rough estimation of how they sound to me at around 60 Phons (I used frequency sweeps and 10 bands of noise covering 20-10k bandwidth. I quickly modelized with some parametric filters so it's pleasing to look at, and left the parametres values so you can see the frequencies the peaks are centered on. Please ignore the red curve. Be aware of the fact this is what I hear so you should at least substract the
equal loudness contour to have an idea of the absolute response)
As you can see it sounds good... but shouty. And i'm usally not against a little 2-3k spiciness. I thought this was because of tuning module misplacement but it kept sounding the same on both chanels even after adjusting them. I think It could be addressed easely making some tweaks to the modules themselves. For the moment Eq does the job nicely.
A part from that it's the best pair of buds I had the chance to hear, and by far. The bass response is absolutely excellent and no need to force a strong seal to get there (which also means no compromises in regard to clarity). Sub 100hz boost, no bloat, no bass bleed whatsoever, that is close to ideal in my book (for an open device). Treble is excellent as well, no nasty high Q peak at 5k as we usually see. Everything is smooth and it's extended beyond 18khz (my hearing threshold).
The result of this nice frequency response is a clean, detailed and satisfactory sound. Soundstage is good, althought I don't find super relevent to comment on this aspect. It reproduces quasi-binaural recordings beatifully though, like a good headphone would. For those who are into binaural post treatment (like Haas effect and complexe reverbs applied to non binaural recordings), the 2.7khz peak is helpful as it prevents the recordings to sound overly dark and the voices to be shifted on on side of the image.
When it comes to the fit I have no complain for the moment. I like the cable and the look (although I would have like it a little more discreet).
In the end it's quite the opposite of what we commonly get. And it's clearly for the better (imo)!