Hi guys! First, I want to clarify that I am not a bassist, but an audio engineer in a jazz club, so double bass is a hugely important part of my work! I have a distortion problem that seems to be following me, and I'm having a hard time troubleshooting it. I'm hoping you can help me. In my club, we have one bass in particular that is our house instrument and another that serves as a backup. The primary bass is a vintage David Gage, and both have relatively new Realist copper pickups. i usually run a mic and a DI on bass, and blend the two sources to taste. But I take an extra step (due to the acoustics and PA setup in my club) of splitting the DI signal into a high and a low, so that I can reinforce only what is necessary, in the appropriate amounts, to supplement the natural sound in the space. The DI I use for this purpose is a Radial PZ, specially designed for piezo pickups. The problem I'm having is distortion on the DI channel. It is primarily in the higher frequencies, so when I split my DI signal, the low one sounds ok, and the high one can be so bad it's unusable. It seems like there is a very low signal threshold under which the signal sounds great, and then quickly distorts. I have bypassed the DI box, tried different quarter-inch cables, different amps, and even switched out the basses. It ALWAYS comes back. Which leads me to believe there is an issue involving the pickups - not necessarily a problem with them, but an impedance issue or perhaps an issue with the fit of the pickup against the bass or the bridge. Like that certain frequencies end up going into the signal chain way too hot. Has anyone experienced a similar problem, or have some ideas as to what I can do? Thanks so much!