I have to recommend an East preamp. I've had many great preamps in basses in the past (Kubicki, Alembic and Bartolini spring to mind) but the item in my ACG is just incredible. Okay, it's not the most immediate item if you're used to traditional boost/cut tone sculpting, but once you've got to grips with it I could not name a better system. They sound absolutely amazing, and are incrediblyversatile too, whilst never losing their character.