So the other day I bought my second bass, an Ibanez SRX590 because I fell in love with the feel and tone in the store. Since I took it home I've been messing around with the tone, but I'm a little bit confused.

When a bass or guitar has treble/bass boost/cut knobs on the instruments themselves, should I be adjusting the treble/bass tone knobs on the bass, the amp or both? Is one better than the other or is it just for convenience?