Well, keep in mind that bart has different J pickup styles, and also does custom winds for LOTS of people.
last time i had them on a bass was in '93, a warwick Thumb 6string.
I hear the same "thing" on youtube, but to be honest, it's to long ago for me to judge...

Anyway, i love the sado's that are in the bass now.

I'm sure you'll love this just as much if not more.