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Which is the P? Which is the J?

It would have been better if you had normalized the volumes. When asked what sounds better people will always pick the louder version of the same recording so it has a big influence on blind audio tests. Granted that we are now listening for tonal differences but it will still influence the outcome while in reality the output of a pickup has no relevance.
 
Comments:
1-Probably if I just uploaded "bass 1" saying it was a P, most - if not everyone - would have bought it.
2-Although they sound very similar, a JJ and a PJ sound very apart... Why? :)
3-It makes a much bigger difference (and it is cheaper) to change the strings than to change from a P to a Jazz with the neck pickup soloed, or vice-versa. :D
 
Bass 1 is a Jazz bass with the neck pickup soloed. Bass 2 is a P bass.
Woot! :hyper:

Maybe it's just me, but I felt the differences became kind of apparent after listening to the clips a couple times through good headphones. To me, a J just has a looser feel in the low end (Loose Booty? :D) while a P bass sounds thicker in the mids and highs--though this line didn't really have any high notes. The P sounded more balanced in the verses, while on the J, the low note seemed louder than the couple notes that followed.

I've never heard an A-C Precision before. I know it's supposed to nail the vintage sound, but it would be interesting to hear it side-by-side with a passive P.
 
Comments:
1-Probably if I just uploaded "bass 1" saying it was a P, most - if not everyone - would have bought it.
2-Although they sound very similar, a JJ and a PJ sound very apart... Why? :)
3-It makes a much bigger difference (and it is cheaper) to change the strings than to change from a P to a Jazz with the neck pickup soloed, or vice-versa. :D

I've heard that adding more pickups to a bass can alter the sound of one of the pups solo'd, when compared to say just having the 1 pup. Also, a P/J bass will have a humbucker J in the bridge position which makes it a dual humbucker bass, a jazz is a dual single coil bass...

although this doesn't help explain why your P vs J study fooled so many, it helps explain why a P/J equipped bass sounds significantly different than a jazz bass.