For the subs do they have to be directly wired to each other in that way or can I wire them thru the external ports on the box. Reason I am asking is because the box that I am using temporarily now has a dividing wall so I can't really hook them up directly in the way you suggested unless I drill a whole thru that dividing wall. Is that alright to do or will it mess up my audio?

Also can you illustrate how it suppose to be done? I am picking up on this vaguely.