DiMarzio D Activator 7 Humbucker Pickup

Active humbuckers have a distinctive sound: powerful, clean, open-sounding, with excellent harmonic overtones and very tight lows.

This also fits the description of a great 7-string pickup, if the problems associated with active pickups sterile sound and limited headroom could be eliminated.

The D Activator 7(TM) does just that.