connecting an active subwoofer to Primaluna PL1

Ditto. Do not do what you were thinking but, instead, tell us exactly what you have to work with.

Kal

It is an Epiphany 250 watts active sub-woofer. On the back there is a low-level output (looks like a tv cable) that goes into my home theater amp (Harmon Kardon)which has a sub-woofer connection. There are also a pair of mono inputs (left and right) as well as a pair of mono outputs (left and right). These look like you can press the flap and insert the wire into the hole. Currently only the low level output is connected to the harmon kardon. I plan to keep the HK for home theater but use the Prologe for music only but would be better if I could connect the subwoofer to it also. Hope this helps

You are right, there is a red and black pair of spring clips and right. It just ath they are labelled as mono which col dbe a misnomer.