So every once in a while I toy with the idea of drastically altering a bass to get a tone that I think I'd like more. To this day I've owned at least a dozen basses and have thought about altering each one of them yet have only done so once (quite successfully I might add, though it was only a pickup swap ). I've recently picked up a fretless bass that sounds great but (there's always a but, lol) I'm looking for a somewhat beefier tone at the bridge so I was thinking of dropping a MM style Bartolini pickup in the bridge position. Currently has a Bartolini humcancelling jazz pickups so it would have to be routed. Normally not a great idea but I'm still thinking. The pickups I'm looking at, the Bartolini MM5CBC and MM52CBJD3) are both the same shape but the first is dual coil while the second is quad coil. What are the general differences in tone between the two? I've never had a bass with quad coil pickups so I have no idea what they sound like. I generally don't keep a bass long enough to consider these things but my two current basses and the one I have on the way have me rethinking my habit of constantly buying and selling basses so I'm thinking of the long haul. Thanks for whatever info you guys can give.