I mean no disrespect to Alembic by posting this:
 
The green wire that goes from the input jack to the circuit board isn't connected for some reason. It's not connected to the board.  Thing is, there isn't a soldering spot for the wire(like on the one's I've seen here). Plus, the bass does as it should.  
 
I may have read something about this topic here at the Club, not sure.

Could it be the wire that goes to the power LED? A lot of folks disconnected the power LED as it added extra drain on the battery.  
 
Keith

Cool, thanks Keith.  Forgot all about it.

Ok, I think I'm over my haven't owned an Alembic for a long, long time phase.