According to a guy that saw it in person and asked an Ampeg rep about it. It is a fully functioning head and cabinet. the head has an Ampeg preamp with 3 SVT poweramps to drive the cabinet. (Sorry, he couldn't be more specific on the models themselves, he isn't a bass player) The cabinet itself is basically 4 Ampeg 8x10's on their side with an additional row of 10's to fill it out to a whopping 36 10's. God bless them. And I pity the fool who has to be THAT guys roadie.