I have a strange problem with my OBP 3. I recently had my repairman install it in my KSD bass. My repairman has installed other preamps for me and even though he is not an electronics specialist he get's the job done. But this may be a bit over his head so I'm asking you guys for advice. When I compare the KSD to my other J Basses the tone control calibration seems to be way off. The preamp has a three band boost and cut setup with the mid frequency at 800hz. In order to get the OBP to sound natural in the bass I have to boost the Treble all the way, the mids 3/4 and the bass control seems to be like on my other instruments.I can only boost it a little before it overpowers everything.. When I switch the preamp off, the bass sounds a little darker than my other basses but the difference is not drastic. All my basses are Jazz basses , all of them have preamps in them (Barts, Sadowskis,OBP1). I have two basses with the identical pickups in them, Fender SCNs So I can really tell that there is something not right with this OBP3 setup. Again, the treble at full is about the same as the treble boosted just a tiny bit on the other basses. This preamp is the only one I have with a mid EQ so I can't compare that directly but it seems that at 3/4 boost the mids are about neutral. This is really odd, I opened the bass up even though I don't know much about electronics either but I don't see any loose wires. Can you guys help me troubleshoot this for me?