I have often felt there is a huge difference in what the tone control does on a passive bass, versus what the treble eq does an active bass. Example: On every passive fender bass i have ever played, rolling the tone off seems to completly remove all the treble, resulting in a sound that is soft, muted, and "closed" (sorry, that's the only word I can think of) A sound I highly like. Whereas on almost all active basses I have played, I just cannot get the same effect! Rolling off the high EQ only gives me a choice of less or more treble. Much like on my amp. Meaning, there is always some treble (and fret noise) left. This is a big reason why I sold my Sterling, and only use my active Carvin for slapping. Even with the active EQ rolled off completely, the sound is still agressive and "Open". Can anyone give me a scientific or logical reason? I asked this same question a few years ago, and was never given a response that made much sense. Rolling off the tone on my jazz bass sounds different then rolling off the treble on my active bass. Passive rolled off= no string/finger/fret noise at all. Active EQ rolled off= less string/finger/fret noise, but not completly gone. Why?