Amp > Ashdown VS212 speaker cab > Second cab jack?

Hi there,

I have an Ashdown VS212. There are 2 speaker jacks on the back - a quarter inch one and a speakon one. If I was to attach another cab to it so I can run my amp at 4ohms, which jack do I plug the second cabinet into? They jacks are unlabeled if that makes any difference.


Cab: http://global.rakuten.com/en/store/key/item/10020485/
Amp: Holden Wasp 200XL. 200W valve, 16/8/4ohm speaker outputs.

Side story: I am planning on turning my old 15" combo (HK BK300) into a cabinet as there is something rattling in the amp itself. It's a horrible, awkward 20-man job even re-inserting the amp to the cabinet to test, so I think trying to fix it would offer quickly diminishing returns.