Hello all and please pardon the naivety here. . .

I've finally joined the 1990's and bought a true surround receiver. Now I have a question:

My Onkyo receiver has a single RCA out for the sub and my Klipsch sub has a L/R (two port) in.

I bought a standard RCA cable.

How do I connect these so that they work. Life was sooooo much easier when I had my old receiver and a pair of Khorns in the corner. . .

Thanks in advance for your help.

Brian