Hmmm, not sure you understand the meaning of 'custom built' in Dave's post? ;-)

That could mean he's used someone elses subs and taken the badges off, which seems to be what you're suggesting. If that's the case, the best you can do is go to a gig and have a sniff around the subs where the cables plug in and see if you can find any names on plates.

Other than that, he could have custom built cabinets with some standard drivers in them. If that's true, you'll need to nick a bass bin so you can disassemble it and copy it. You'll also be able to see what's drivers he's using.

Of course, he might have custom specced drivers in which case you're fucked. Even if you could find out who made them, they're not gonna give out Dillinja's trade secrets to you ;-)

cheers,

Chris