The JA Set is based off EMG's original J, but uses radiused Alnico V magnets instead of ceramic. This creates a tone that is warm and open for a more vintage sound with a similar broad frequency range and clarity of the original. The JA provides bass players with natural presence, powerful lows, and expansive midrange. With our quiet and dependable preamp on-board, this pickups set is great for the studio or the stage. Whether you play fretted or fretless you'll get an incredibly full sound with these bass pickups.