I have the custom fit plugs and was wondering soundwise how do they compare to using the small triple flange in terms of response? Certainly block all outside noise and seem to have plenty of bass but just wondering if for best sound quality if perhaps it is preferred to use either the flanges or foam plugs instead of the custom fit mold? Or does the mold create a tilted response of its own that needs compensated?
I have the ACS custom molds. Fortunately I have no adverse affect on the ER4 or HF2, I get vastly improved comfort and slightly better isolation, I would say also slightly improved sound as the custom moulds seem to direct better than the stock tips. I guess custom tips are risk that must be taken if you want the comfort with Etymotics.