550. Do your own homework. It's a extra pair I ordered. More details, spatial ambience and different from most technologies. Put it this way I had dynamic, planar and electrostats. And this takes the the best of each and put it together. At cost I fork out 400ish(350 +50 shipping). 150 is not a lot to ask for 2 years of wait and 5 months of shipping limbo. Saves a lot of aggravated chat.