I am currently using and SVT-810E cab on a SVT pro 3 head. To connect the cab to the head, the cab as 3 options to use. I use the #3 connection according to the manual (http://www.ampeg.com/pdf/SVT810EAV.pdf). For this connection it says : Speakon® Lower 4X10 Dual Mode or Mono Mode Input/ OutputJacks My question is, by using this connection, am I only utilizing half the speakers in this cab? I been trying to listen to and feel the amp when I am playing to see if the whole thing is working or if only the upper or lower half is working. Any help would be greatly appreciated. Ive searched the forum for an answer and didnt see a related topic.