That would be Matt Wong. He usually plays an Ampeg SVT of some sort into an 8x10 with a 5 string EB Musicman. It's the staple setup of the OC Ska scene (Bill Uechi from Save Ferris and Starpool uses the same setup and sounds a lot alike - great guy). Neither of them use picks, it's all fingerstyle for what I've seen.
http://youtube.com/watch?v=SSuEMJ_48YE - should give you at least a glimpse of what he does, he's normally pretty quiet and just plays in the background.
I myself went through an army of basses and amps and settled on the Ampeg/Musicman combo because it works so well for the music (and because I heard Matt Wong).