When I was wearing on-ear and over-the-ear Grados, I was surprised at how much difference it makes to adjust the fit of the headphones. When I moved into IEMs, the same principle applied. Everybody talks about the poor bass on the Etymotics, and they're right, but if you have the patience to screw those earpieces in with the right tip and the right orientation, you get what you need. People speak of the HF roll-off of the SE530, but for my money, what they're hearing is a lot of mids. Check the frequency response graphs at Headroom and you'll see HF roll-off across the board, with most monitors rolling off the HF not much differently from the 530. So, I experimented with the tip (the SE530 does have a little longer stem from the shell to the tip, as well as a kind of speed bump preventing the tips from being pushed back too far). I cored a foamy tip and replaced it with stethoscopic tubing. Sliding the tip over the tubing, which I had slid over the stem, I got a wider aperture than typical with a normal foamy AND it was closer to the shell. The HF opened up. I'm not sure it was better but it was there for those who don't get enough HF in their diet. So, yeah, how you position the tip does make a difference in performance.