Hi there,
I'm more of a 5 string player and I've got a 1998 Warwick Streamer Pro M 4 string in natural oil possibly going if you're interested, see link below for more info on the model;
[url="http://www.warwickbass.com/modules/produkte/produkt.php?katID=22025&cl=EN"]http://www.warwickbass.com/modules/produkt...22025&cl=EN[/url]
The neck is wenge, not ovangkol (darker and more open grain than the latter) and the pre-amp has either been modified or came as a later option. It's like the Thumb BO, first pot is volume (push/pull, active/passive), second is balance and third is dual concentric bass and treble cut/boost. I've also changed the nut to a 'just-a-nut' I as I like the brass ones better (I still have the 'just-a-nut' II though).
The bass is in pretty good nick but it is used and 12 years old! If you're interested I can send you some pics next week.
James.