I recently purchase a parasound 2205a amp which has a 12v trigger as does my AVR. However the AVR as a 1/8mm plug but the amp doesn't. It seem to have something that close resembles speaker input. From what I can tell it looks like it had a place for 12v and ground. How can I connect the two. I have a spare 1/8mm to 1/8mm (both male) cable. Can I cut this open and disconnect the appropriate wires or is there a better way?