I bought a 60th-anniversary Fender P -- the "blackguard blonde" model -- almost 8 years ago. It's only the second bass I've bought brand-new in almost 20 years. It arrived with a nearly perfect setup -- just needed some minor tweaks -- and the only adjustments to the setup I've made since have been for occasional string changes. I love everything about this bass and have barely touched any of my other basses since then. However, one thing I've noticed about it over the years has been that it always sounds like I have some kind of mild "dirt" or something turned on. I've generally liked this just fine, as I usually like to add a little something anyway (e.g., a Sansamp VT Bass) to my signal. But every once in a while I'd like to have a completely clean tone, and when I've turned off all my pedals it still sounded like some kind of (mild) effect was on. I never gave it much thought, though, and just assumed the sound was being colored by the the amp, or a not-true-bypass pedal, or something. Then it finally dawned on me recently, while reading a discussion about pickup height here at TB, that maybe my pickups were too high. I'd just never thought about it; I guess I assumed the pickup height was "correct" when I bought it. A quick "nickel test" suggested that they were indeed too high, so I brought a screwdriver to my next band practice and lowered the pups a smidge to see if it made a difference. It did. After practice I asked one of my guitarists if he had noticed any difference in my sound, and he said that it was "punchier" than usual and that he liked it. A few days later, at practice with my other band, I lowered the pups a little further. I really wanted a clean sound that night since our drummer couldn't make it and -- holy crap -- I finally got the clean sound that had eluded me for 8 years. So yeah, I'm an idiot -- but have you checked your own pickup height lately?
Not lately, but pickup height is definitely an item on my setup check list. I have some basses - this Gretsch Broadkaster in particular - that are very intolerant of "incorrect" pickup height. Some of them are fairly tolerant of variations; some less so - kind of like your P-Bass; but a few are like the Gretsch. A tiny fraction off either way, and I get either a weak signal (a hair too low), or weird chorus-y squealing (a hair too high). And, to make matters worse, there's almost no adjustment available from the thin foam under the pickups. I pretty much have to use shims - like the original Pre-Baldwin New York Gretsch's used to do. But, yeah; I do check pickup heights...
When pressing down a string at the highest fret, I couldn't fit a nickel between the pickup pole and the bottom of the string. The standard recommendation is the width of a nickel (5/64") on the treble side, and a bit more than that on the bass side.
I did a live multitrack recording for a local rock cover band and kept getting some really harsh clicking sounds from the bass player. It wasn't in the sound check and was intermittent through the show, but happened more often in the harder rocking tunes. During their break I tried to figure out where the sound was coming from (bad cables or loose connections or faulty amp and cab?) but couldn't track it down before they were on again. After the show I asked to see his bass. The pickups were almost touching the strings. I asked him to play fairly hard and I could see and hear the strings hitting the pickups, which made a dreadful noise. I suggested he might lower his pickups but he refused, saying he wanted the sound to be "as loud as possible" and that meant the strings needed to be really close to the pickups. I did a quick mix and master job and managed to minimize the pops on the bass track. This is the main reason why I don't do this as much anymore. Band sounds like poo because of some problem or other that should be easily avoidable and they expect me to click a preset on my DAW and make everything magically sound fantastic
I adjust them too close on purpose & then back off just enough so there's no CLACK! of the string against the pole pieces.
Well, that's fine if you always want some dirt in your sound, and if you always add a overdrive or fuzz you might not even notice. Personally, I'd much rather have a clean signal coming out of the bass, so I can add dirt with a pedal when I want it but not when I don't.
You don't always have overdrive if you roll back the volume knob a little (this is how guitar players clean up). I don't use pedals for overdrive, so I want it from my bass & my amp. I won't even use covered pole pieces for this reason, because the strings can't get close enough to the pole pieces for my tastes.