Etymotics have always been known to be 'lacking' in bass. Their popularity is that they are amongst the most accurate IEM (In Ear Monitors) on the market. Very analytical sounding, exposing every detail very clearly.
There are other IEMs that do a better job in the bass area, but there are some trade offs with the detail.
Personally, it is detail and accuracy that I look for, not artificially 'enhanced' bass.
Long live 'fidelity' I say!