I want to add one thing --- I didn't get the chance to A/B the SS01 directly against the FXT90, so I don't know what the sonic differences are. I can only say that I did not remember being this thoroughly impressed by the FXT90. The SS01 definitely feels cleaner and less grainy. Whether this means that my sonic memory is completely shot, or that I've gone deaf since the last time I heard the FXT90, I don't know. I can say, though, that I thought the FXZs were crap, and the SS01 definitely feels like a well-balanced earphone.
However, I did find this picture on the web:
While I have no idea whether or not that is the final FR curve of the SS01, it does look hauntingly similar to the FR of the FXT90 (here and here). While really hope that the SS01 does indeed use a newer generation of micro drivers, at least, there is the chance that it sounds extremely similar to the FXT90 and that I'm just plain stupid.
Tyll comes to the rescue! Measurements of the SS01: http://www.innerfidelity.com/images/MOESS01.pdf
Looks better to me! Thank you for making me sound so smart! I could kiss you, Mr. Hertsens! Back to hype and hyperbole!
Quick Photoshop Work:
In all seriousness, there are similarities. The resonance points are quite similar (though some of them may be artifacts of the HATS), but the apparent difference is a noticeable improvement on the bass driver. It's no longer overly mid-bassy, and gets rid of lower midrange "bloat". InnerFidelity doesn't do CSD plots, but this plot alone can account for improved transparency. I didn't composite them together, but impulse and square wave plots look tighter too.
So, the only way to settle this is to have someone who owns the FXT90 compare the two. When I get an opportunity (in the next few days), I'm sending the SS01 over to jgray91, who will hopefully do an in-depth comparison between the two, so perhaps everyone should hold your horses 'til then. After all, the FXT90 is heavily discounted these days and is basically the same price as the SS01, giving it at least an aesthetic advantage over the SS01. However, let's hope for all our sakes (and MOE Audio's) that the SS01 at least sounds distinct from MOE/Aipon's two year-old OEM product...
I apologize if my capricious and half-hearted attempt at a review got everyone giddy (never trust a review written without revisions).
Edited by tomscy2000 - 11/10/13 at 6:42am