My ER4Ps are great for detailed mids and highs--incredible--but meh for bass. It's there, but it's uninspiring because it's overshadowed by the clarity of the mids and highs. And I think this is why sometimes people are disappointed in balanced armature IEMs when it comes to bass, even though they can be boosted to have a bass emphasis.
(and yes, I use the ER yellow foamies to make certain I get a deep insertion and great seal--lol)





















