I've got a strong recommendation to make about this IEM.
I found a set of foam tips that make these sound a little more fuller and rounder, thus adding sub bass and, at the same time adds atmosphere and open up the mids and significantly the highs.
How they achieve these things? The have a short and narrow bore (narrower than the nozzle) and they open up like a funnel about 3 mm before the out of the tip (sound out). I thought they were like a funnel. But now i really think they are somehow like a hourglass, with the outer part bigger than the inner part. So, narrow bore adds sub and mid bass i think and the funnel out open the mids and especially the highs...
VSONIC Soft Foam Eartips : http://penonaudio.com/VSONIC-Soft-Foam-EarTips?search=tips 7,5 Dollar
They need a little patiente to get in the nozzle but once they get...Heaven. Really. I have now a big collection of tips and this is a solid recommendation.
If anyone tries tell after how it sounds for you
Edit: I'm hearing sub bass on these like never before! So happy, really
Now they are quite complete.