Proac Response 1sc hookup

Hi,

I just received a very nice set of Response 1sc's (no manual though) and I have what is probably a dumb question. These have what I assume are the stock jumpers between the 2 sets of binding posts and these prevent me from tightening the posts enough to grip a spade lug on my single wire cables. Luckily I have another pair of cables with bananas that I can use but I was hoping someone could explain what I'm doing wrong.

Thanks,
Wes