I bought a DiMarzio P/J set from a fellow TB-er, and installed them today, and the sound was very strange. On both pickups, there is a HUGE difference in level and tone between the top 2 and bottom 2 strings. On the P pickup, the E is normal, the A is funny and out of phase sounding and the D and G are about 1/4 the level. On the J pickup, the E and A are very low, and the D and G are loud and normal. To be sure it was not my wiring, I connected the wires from each pickup directly to an input cord and tested them - the result was the same. When I received the pickups, one of the 4 magnets on the J pup were loose, I wonder if the magnets have been monkeyed with? Are they supposed to be hot glued in? How to test the polarity? I'd like to make them work, so your comments will be appreciated.