Well I tried these with a huge amount of tips now, olives, Comply's, biflange, triflange, Sony's and NONE of them change the sound from mediocre to good. I really don't understand what the fuss is about. Very flat, no dynamics, nasal, no warmth or decent bass. I mean, they're not bad for $8 IEMs but I wouldn't pay much more for them. I'm really curious as to how some people in here seem to go totally bananas over them. I wonder what they are comparing them to. Maybe they have special ears. :D
I've compared them to Brainwavz M1, M2, ProAlpha and Beta, Hifiman RE0, Fischer Audio Evolution, Superlux HD381 and Teufel Fidelity.
Try contacting Monoprice. I personally did not care for them, but they do sound pretty good. There was talk pages back about there being some that just sound bad, and it being a flaw in the driver or something. Anyway, if you call Monoprice and complain about the poor sound quality, they will likely replace them. You probably have a bad set.