I posted a thread a few weeks back about my cheap 5 string bass project with P style split pickup(Seymore Duncan Quarter pound). The problem was the low B string was way low on volume. I took it out and installed a Carvin J99 Jazz bass style pickup and now the strings all have the same volume. The P style pickup was way fatter on the tone, the J99 is sweet and smooth with more slap. I guess the low B string was physically outside the magnetic field of the P style pickup.