Hi Ozkan, sorry for late reply, been busy these days.
I just did some comparison today, and I would say in for the level of clarity vs bass, top would be the highest clarity with lesser bass, down to the lowest clarity with more bass:
IM50 without nozzle filter (clearest, less bass)
IM70 with nozzle filter (balance)
IM50 with nozzle filter (less clarity, more bass)
Please note that the difference is small, not night and day kind of differences.
As for which one I like, with or without nozzle filter, I like the IM50 without the nozzle filter, nice clarity with still good level of bass, although slightly less bass than IM70, but also slighlty better clarity than IM70.
I don't think for those who already bought IM50, to buy again IM70. The difference is small, and IMHO not worth the extra bucks. If you want more clarity, just remove the nozzle filter. Want more bass from filterless IM50, use smaller bore eartips.
I think I will keep my IM50 nozzle open, without the filter. I like it that way.
Hope it helps ;)
DIY switch box for comparing IEMs.
On the picture above, I was experimenting with smaller bore eartips from Earphones Plus:
That's why there is blue color on the eartips. I like that eartips with IM50, a hair more bass than the stock tips.
Edited by earfonia - 7/12/14 at 9:41pm