The essentials of playing live:
- A bass
- A way to get the sound of the bass to the audience
- A way for *you* to hear what you're playing
In any stage situation, you'll either be running the bass through a PA, or you won't.
If you are, you need some way to get the signal from the bass to the PA. Typically this is done with a direct box or DI output on an amplifier (combo or head). If you aren't, you need a pretty powerful amp, either a big combo or more typically a stack of some kind that can crank out enough volume to fill the room.
For hearing yourself, you either need an amp on stage, or your bass sound fed back through monitors, either on-stage wedges or in-ears. Most people use wedges (speakers that are wedge-shaped so when they sit on the ground they aim at your ears).
Additional stuff that really helps--a tuner, some kind of equalization or preamp (if you're using a direct box), spare cables, a hard case for your bass, extra strings, extra batteries, extra basses, etc. There are as many gig setups as there are bassists.
This is my current setup. My band uses in-ear monitoring and we have our own PA, so I don't need any kind of amplifier on stage.
- A bass or two, depending on what I feel like playing that night
- Line6 Pod X3 Live - this does triple duty of a preamp (and amp modeler), a DI, and a tuner
- Radial ProD2 direct box - backup in case my Pod dies
- A backpack with 3 instrument cables, the power cable for the Pod, a power strip, a spare headphone cable, extra strings, my vocal mic, a SM-57 in case we have a mic die, an extra power cable that fits most amps, a 50' mic cable, the instruction book for my Pod, some gaffer's tape, a couple guitar stands, and my in-ear headphones. My band calls this the "magic bag" because whenever something breaks on stage, I invariably have the spare we need to keep the show going.
If we are playing a festival-type gig where the PA is provided and we're not using in-ears, I will also bring my Markbass CMD-102P (a 300W 2x10 combo) so I can hear myself on stage. I really like that amp since the cabinet is a kickback design, so I'm firing bass at my head instead of my shins without needing a tall stack. I run the output of my Pod to the PA, and also run it to my amp so I can hear myself.
In my previous band, I didn't have the Pod or the in-ears, so I'd bring the Markbass combo with a 1x15 extension cabinet. I'd run the DI output from the Markbass to the PA if there was one, but the 2x10 and 1x15 was enough to carry small clubs if necessary.