This updated line-up includes active, passive, 4 & string models, as well as some signature models (Michael Anthony and Nathan East).
The BB614F is the active 4 string model in this series. As you can see, it is a lined fretless, so it is also very easy to play
Controls are: Volume, Balance, 3 band EQ (Bass, Mid & Treble).
The tried and tested PJ pickups become really versatile through the active preamp. You can easily get a deep tone that is great for reggae and rock, but also good definition and crystal highs for modern techniques.