I am looking for a little more volume and boom on my Yamaha bass. I have D Addario Chromes on it cause I like the thump. Now I'm looking for a pup upgrade and don't know whether to get a Dimarzio's, 1/4 lbs, or what. I want low end boom. My RBX-170 has a P an J setup. I only play with the P pup on, but when I need more attack I dial up the J pup, so I'm looking for a loud, boomy, lowend filling P pup.