My mid 80's Aria Pro II has 2 guitar sized humbuckers both measure at about 7.6k. I have MANY guitar humbuckers....have spent countless hours swapping different magnets...A2,A3,A4,A5 with varying magnet strengths in & out of lots of guitars. I KNOW what magnet can swapping can do in a guitar pickup; from the soft,mellower more compressed A2 sound to the more powerful bottom end and tighter tone of A5. I also have several Bill Lawrence guitar blade humbuckers varying from 6k (bright and clean with great bottom end) to super hot early 500XL and another very early Lawrence that is a hot brighter wind. BUT, I am curious about trying a traditional guitar humbucker in this bass that I can swap magnets in & out of. I can swap magnets without actually removing the pickup...its easy to do if you have sufficient wire length. Has anyone experimented with different magnets in bass guitars (which obviously you would need a bar magnet humbucker like most guitar humbuckers have)? Btw, I have a 71 Musicmaster bass that has the stock pickup (guitar pickup?) and it is an excellent sounding bass. You should hear it thru my buddys early 70s Ampeg SVT rig!