I use Etymotic ER4XR at the gym. You need to wear the wire over your ear and the wire in front of your neck to kill the micro phonics. The tonal balance very closely matched my home system and they have the best noise isolation on the market. I own the ER4SR too and find them thin in the bass. The XR is more correct to my ear. I have also owned the Etymotic Evo but found them heavy and odd fitting so I went back to the ER4XR. The mids on the evo are clearly more transparent (almost as good as my speakers…) but without the XR and Evo side by side you would not know. I have owned $1000+ EIMs and always seem to come back to Etymotic.
I also cut off the smallest flange of the triple flange tips.