I concur with what Chico says about the ican's 3D switch when on high. It helps with instrument separation by placing some of them outside of the headphones, so to say.
On the box there is a graphic design of the 3D effect that basically nails its description. It shows the main singer inside the phones while the back up musicians are placed outside the phones.
Here's the visual aid:
One great thing about the the 3D effect is it gives the bass more space and room to operate. It's almost like it improves the technicalities of the bass and makes it more open and less muddy.
Using the bass boost in conjunction with the 3D is quite nice as once you give the bass some extra room it responds better to bass boost. Using them both together also works well because the bass boost slightly counterbalances the bit of air added up top from the 3D setting with just a bit of warmth down low.