I'm learning this track Word Up and was watching the video on you tube an at approx 2:19 into the video some guys come out from behind a door. I'm sure the first guy out is carrying an Alembic bass.
He passes the screen in under a second so you have to be quick.
of course I may be wrong.
Have a look for yourself.  
http://www.youtube.com/watch?v=MZjAantupsA&feature=youtu.be&t=2m18s
 
Jazzyvee

Interesting - I tried to freeze it as he goes by - to me it looks like a Spector? It's maybe unusual because the headstock is natural wood, not black like you might expect with a Spector, but maybe the ones back then were more boutique? Obviously I don't know a lot about Spectors!

It's a hard call as the bass goes bye so fast and quite hard to freeze frame it without a blurred image.
 
Jazzyvee

That is Aaron Mills with his Alembic.

The bass is a Spector NS 1.  A very cool bass from back in the day.  Here's a link to Spector's historical page:
 
http://www.spectorbass.com/about/spector_years_1.html
 
And here are a couple of links to Aaron playing his:
 
http://www.youtube.com/watch?v=biNqGRhYwHE&feature=related
 

 

To the best of my knowledge Aaron still plays the Spector along with a 5 string Fender Jazz bass. An under appreciated bassist in my opinion. I filled his position when he left the Bob Funck Band a few years back.  
 
Keith

Man I need to get my eyes checked.  Sure looks like an Alembic Logo when I freeze the image.

It's a series 1 with the crown headstock!

When I freeze it, I see a headstock mounted truss rod cover.

Yeah, that's what I saw, too, Michael.  
 
Peter

I still think it's a Spector - the top of the headstock doesn't look like a crown to me, it's more rounded.

It does seem to have a truss rod cover on the headstock, but click frame by frame and look at the logo.  Must be a trick my mind seeing the Spector Logo as an Alembic Logo.

Early Spector headstocks (Brooklyn era):
 
http://www.spectorbass.com/about/headstocks_brooklyn.html

Thanks Musashi