DiMarzio DP219 D Activator Humbucker Neck Pickup (Cream with Gold Poles)In 2006, DiMarzio took a close look at the most popular active neck and bridge humbuckers to see if they could capture all of the good qualities and eliminate the disadvantages: cold sound, limited dynamics, running out of headroom when played hard, and the need for batteries. The end results are the D Activator Neck and Bridge. They use coils tuned to specific frequencies. The purpose is to shift the resonant points of the pickups to the fundamentals