I was doing a bit of an overhaul on my Squier P-bass special. I was adding a DiMarzio Ultra Jazz at the bridge. This is the first time I have installed a pickup. I had heard about pickups being out of phase before, but had no real idea what that was. I installed the DiMarzio. Before putting the pickguard back on and restringing, I plugged in and gave the pole piece a tap with my screwdriver. The DiMarzio gave a small pop and the original P pickup gave a loud pop. I thought this was strange, but I decided things were working and to close it up. After restringing I gave it a go. Boy was I disappointed. Each pickup by itself worked great, but together they were weak and nasaly. So I looked up the generic 4-conductor directions from DiMarzio (it would be nice if these were included along with the model specific directions). They said if the pickups are out of phase, swap hot for ground on the DiMarzio pickup. So I did and it worked beautifully. Attached are two recordings of the same passage. The first using both pickups out of phase and the second using both pickups in phase (forgive the poor playing). I hope this helps someone else identify this problem or at least gives some fellow TBers a good laugh.