What type of pickups on Dean Edge Hammer 4 ?

Hi,
I have a Dean Edge Hammer 4 bass and I want to replace the active pre-amp because the bass and treble controls aren't doing anything. I did have this checked at a guitarshop, but they couldn't find something wrong and said it's probably normal behavior...

I put a question about this in another thread, this one is specific about the pickups in my bass.

I can't find out googeling what specific type of pickups are used in the Dean Edge Hammer 4 bass. Is there anyone on this forum who might know this?
I have found out that the pickups are probably of a humbucker type, because they use 5 wires per pickup.