I've gave the headphones I use on my smartphone a try on my Madison and was pleasantly surprised at the quality of the sound coming through the headphones as opposed to the two external Cobra 500 speakers I use. Problem is that the headphone wire is very short. I'd like to purchase a 6 foot extension cord. There are so many choices. I just want to make sure I purchase the correct one. Is the plug in the photo considered a three (3) pole jack? Thanks. PS. If you've got a set of headphones and never tried using them to listen to your receive I suggest you give it a try.. Thanks. 73