I bought an Ibanez SR406 off of Ebay as a project bass, it's got the Dx6 pick-ups in it. I installed an Aguilar OBP-3 and the bass sounds good, but the pick-ups leave a lot to be desired. I have my heart set on the Bartolini Quad Coil's, I would like to set it up using coil tap for different configurations. The current pick-ups are an EMG shape ( EMG40), so I can go the route of EMG also. I was wondering what the difference would be between the two pick-ups, I like a lot of growl in my tone. Thanks.