The sound of my SX, even with upgraded pickups, can have a bit of a harsh treble. I know the pickups aren't all to blame for this because I've played dimarzios in other basses with the tone all the way up and it didn't sound too harsh. The tone pot on the SX seems really trebley most of the way and then when it gets close to all the way down the treble roll off is really sudden. I know a new tone pot will help the evenness, but does it affect the sound itself? Is the sound of a good pot tone pot on full different than a crappy pot on full?