one of my duncan designed pick ups is broke on my jackson kelly bass. the material cracked around the magnet. the pick ups in there now are passive. i play hard rock mostly. what p/j pick ups should i get for this bass? should i go active with a set of emgs and wire it to 18 volts? what is the difference in sound between active and passive pick ups? i like the sound of this bass now, i hate that the j pick up is broke. thank you for any and all info.