I've got a Carvin 5 string bass I built from a kit. It has a 3 band EQ, which is supposed to be bass, mid, and treble. The problem is that the bass and mid knobs sound pretty much exactly the same, as if the wrong parts were put in to determine the frequencies. I have enough electronics experience to change out the components in order to get a different set of frequencies, but I don't know which ones to change, and what to change them to. Does anyone here have any experience with one of these preamps, or have any ideas about what i will need to change? Thanks!