[quote name='Grangur' timestamp='1459871973' post='3020459']
Just what I've found with basses I've played. I've seldom found a thin necked bass with a good deep growl. Most produce a thin metallic tone, that most folk seem to call "punchy".
[/quote]
I've had two Hohner B2 5-strings, identical other than the pickups and one being active. Quite a chunky neck on them both of course, the passive one sounded quite thin in comparison to the active one. So necks may be a variable but I haven't found it myself. My extremely slim-necked Warwick has a good deep growl that's identical to the baseball-bat-necked Warwicks, so I would say that's two empirical results which show you haven't looked at the right slim-necked basses.