Tips can help with bass, but really, using EQ or trying the E3 is the way to go. As noted, my custom tips extend very deep into the ear canal, and that helps with bass, but most universal tips will not. The Ety bi-flanges I use with my Image S4s deliver bass nicely (compared to the hybrids, for example, which sound thin with the S4s), so that could work. Mine are an old pair I got with my ER4Ps, like 2-3 years ago. They are gray.You can try the Ety bi-flanges, the ones for the er6i (18C is the stock number for small, 18 is large). They will fit, as will any of the tips for the ER4P. But again, the tips are only going to do so much. Once you get a good seal, the bass is the bass. Comply T100 should also work in terms of seal and maxing out the bass.