+1 for pickup setup and playing style. - 90% of the time in my experience.- (I'm assuming you have taken the time to make sure you are not clipping the board with the signal, if so turn down the gain or pad the signal - bass Di's can have strong signals and tend to have overdrive knobs - make sure those are way down on the DI) - Am I right in guessing you do sound for alot of punk rock bands? Its surprising to me how many neophyte/ignorant bassists cant recognize this. They prefer the pickup on a bass right next to the string. Its very easy to get this "popping and cracking" sound on a fender bass (the worlds most popular bass) by having the pickups too close to the string. As soon as the song kicks up and the bass player starts vamping hard its all over. All you can do sometimes its just try to bring out the lows and cut the highs and mids and make it tolerable for the audience.