Looks like the dunu titan 1 has around 12db of external noise attenuation and since the fiio ex1 is a copy of the dunu's they should have the same isolation. I couldn't find specs for attenuation on the zs6 but according to massdrop they supposedly have "active noise cancelling" although from...

Pulp fiction soundtrack Haywyre- The Voyage album Courtney Barnett- The Double EP album Gary Clark Jr.- Blak and Blue album

As of right now it would be Courtney Barnett.

I haven't tried them personally but the dunu titan 1and fiio ex1(dunu titan copy) are basically semi open iems.

For me Akg 3003 and Etymotic er4 come to mind.

I own both of these and agree with the posts above. The t50rp's need a significant amount of more power to reach a nice listening level. For instance when I switch from the t50's to hd 600's I turn the volume down about 25% before plugging in the 600's otherwise they would just be blasting. I...

Interesting

I've never tried going balanced. How does the sound change/ improve going from a shared ground to balanced?

I love my 600's as well and just kept the stock cable but if you really want a different cable I would just get a 650 cable or make one out of mogami bulk cable. I never believed in differences in cables until I made my own guitar cable out of canare or mogami and it sounded MUCH more clear but...