The JAX is based off EMG's original J, but uses radiused Alnico V magnets instead of ceramic and our X Series preamp. This creates a tone that is warm and open for a more vintage sound with a broad frequency range and added dynamic response and feel. The JAX provides bass players with natural presence, powerful lows, and expansive midrange. With our X Series preamp on-board, this pickups set truly bridges the gap between passive and active tone - giving players the best of both worlds. Whether you play fretted or fretless you'll get an incredibly full sound with these bass pickups