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Parallel P preamp idea

you can flip the actual output polarity of one coil of a P pickup and get away with it because the two coils never both "hear" the same string.

you might still get a little weirdness around the D and A strings, especially if they get bent to where they drift into the zone between both coils.
 
I don't think it would be any different than a standard, series 2-coil p-bass setup. In both, the common signal of the string would be mostly cancelled, and we're not adding anything new or changing the relationship of the PUs to the strings.

The pickups don't sit at exactly the same location, so anything bleeding to the other pickup cannot be completely cancelled since it won't be exactly the same signal, but, again, that's not changing.
 
no, standard P pickup coils are reverse-wound and reverse magnetic polarity; the hum gets canceled but the signal outputs of both coils are still in polarity with each other.

were they both positioned under one string, you'd get a significant boost from the series wiring.
 
the magnets have no effect on the hum, that just comes from the coil itself.

take two identical coils, wind one the opposite way and the hum and the signal gets reversed; now flip the magnets of one coil and just the signal gets reversed again, back to being in polarity with the other coil.

this is the entire secret behind RWRP humbucking pickups.
 
in all the years i've been installing these and through all the different revisions i have never seen any hint in the instructions or on the pickup itself as to which coil was meant for which side.

You didn't look hard enough. Invalid Link Removed The D-G coil has the 5 pin cable hooking it up and the B/E-A coil has the two pin connector hooking it up. It was more confusing before they pinned the pickup this way (in the past) but it's always been this way from what I understand. It becomes more important on the 5 string version to get it right because the magnet is only extended on one coil.
 
your link didn't work, but if you're just referring to the classic EMG picture diagrams, i think that's just a matter of placing the coil with all the connections on it closer to the control cavity for convenience.

Big +1 on the 5-string version though, that has one of the two coils longer inside the housing to cover the extra string.