Exactly, the triger can be operational even if the cables are stereo or mono 3.5 mini plug.

I used a 3.5 stereo with my EP600 and have no probs.
My receiver do not having a triger, no problem i use a litle transformers (Adjustable 1 to 12 volts)with the auto ac goes on the harman receiver start. The ac output turning off when receiver off.
Working whitout any problem. And dont forget its low cost...