DeliriumCordia
100+ Head-Fier
Comply foams (their website will you choose tips that fit the ER4 nozzle). This will boost the bass a bit, but should retain most of what you're used to. Or, look for the small long stem tips.Love my ER4XR but does anyone have a tip suggestion for very tiny ear canals. I tend to have pain after listening for 30+ minutes when inserting with the stock tips (tried all).
To my knowledge, the bi flange tips Dealux mentioned come with the er4xr/sr if you can find the newer packaging and are not yet for sale.