+1While there is no "wrong" way to set the preamp, the Bongo's preamp is pretty powerful...a little cut or boost goes a long way. Most basses I have used with an active preamp will get a little hissy if you boost the treble all the way. Unless you are playing through cabs with no tweeters, or tweets turned off, I would recommend against boosting the treble to the maximum on ANY bass, including the Bongo. I wouldn't be too concerned about it being abnormal.